mm: introduce fault_env
The idea borrowed from Peter's patch from patchset on speculative page
faults[1]:
Instead of passing around the endless list of function arguments,
replace the lot with a single structure so we can change context without
endless function signature changes.
The changes are mostly mechanical with exception of faultaround code:
filemap_map_pages() got reworked a bit.
This patch is preparation for the next one.
[1] http://lkml.kernel.org/r/20141020222841.302891540@infradead.org
Link: http://lkml.kernel.org/r/1466021202-61880-9-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/filemap.c b/mm/filemap.c
index 20f3b1f..54d5318 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2128,22 +2128,27 @@
}
EXPORT_SYMBOL(filemap_fault);
-void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf)
+void filemap_map_pages(struct fault_env *fe,
+ pgoff_t start_pgoff, pgoff_t end_pgoff)
{
struct radix_tree_iter iter;
void **slot;
- struct file *file = vma->vm_file;
+ struct file *file = fe->vma->vm_file;
struct address_space *mapping = file->f_mapping;
+ pgoff_t last_pgoff = start_pgoff;
loff_t size;
struct page *page;
- unsigned long address = (unsigned long) vmf->virtual_address;
- unsigned long addr;
- pte_t *pte;
rcu_read_lock();
- radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, vmf->pgoff) {
- if (iter.index > vmf->max_pgoff)
+ radix_tree_for_each_slot(slot, &mapping->page_tree, &iter,
+ start_pgoff) {
+ if (iter.index > end_pgoff)
break;
+ fe->pte += iter.index - last_pgoff;
+ fe->address += (iter.index - last_pgoff) << PAGE_SHIFT;
+ last_pgoff = iter.index;
+ if (!pte_none(*fe->pte))
+ goto next;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -2179,14 +2184,9 @@
if (page->index >= size >> PAGE_SHIFT)
goto unlock;
- pte = vmf->pte + page->index - vmf->pgoff;
- if (!pte_none(*pte))
- goto unlock;
-
if (file->f_ra.mmap_miss > 0)
file->f_ra.mmap_miss--;
- addr = address + (page->index - vmf->pgoff) * PAGE_SIZE;
- do_set_pte(vma, addr, page, pte, false, false);
+ do_set_pte(fe, page);
unlock_page(page);
goto next;
unlock:
@@ -2194,7 +2194,7 @@
skip:
put_page(page);
next:
- if (iter.index == vmf->max_pgoff)
+ if (iter.index == end_pgoff)
break;
}
rcu_read_unlock();
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 1a90f55..bc5abcb 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -821,26 +821,23 @@
set_compound_page_dtor(page, TRANSHUGE_PAGE_DTOR);
}
-static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
- struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd,
- struct page *page, gfp_t gfp,
- unsigned int flags)
+static int __do_huge_pmd_anonymous_page(struct fault_env *fe, struct page *page,
+ gfp_t gfp)
{
+ struct vm_area_struct *vma = fe->vma;
struct mem_cgroup *memcg;
pgtable_t pgtable;
- spinlock_t *ptl;
- unsigned long haddr = address & HPAGE_PMD_MASK;
+ unsigned long haddr = fe->address & HPAGE_PMD_MASK;
VM_BUG_ON_PAGE(!PageCompound(page), page);
- if (mem_cgroup_try_charge(page, mm, gfp, &memcg, true)) {
+ if (mem_cgroup_try_charge(page, vma->vm_mm, gfp, &memcg, true)) {
put_page(page);
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
}
- pgtable = pte_alloc_one(mm, haddr);
+ pgtable = pte_alloc_one(vma->vm_mm, haddr);
if (unlikely(!pgtable)) {
mem_cgroup_cancel_charge(page, memcg, true);
put_page(page);
@@ -855,12 +852,12 @@
*/
__SetPageUptodate(page);
- ptl = pmd_lock(mm, pmd);
- if (unlikely(!pmd_none(*pmd))) {
- spin_unlock(ptl);
+ fe->ptl = pmd_lock(vma->vm_mm, fe->pmd);
+ if (unlikely(!pmd_none(*fe->pmd))) {
+ spin_unlock(fe->ptl);
mem_cgroup_cancel_charge(page, memcg, true);
put_page(page);
- pte_free(mm, pgtable);
+ pte_free(vma->vm_mm, pgtable);
} else {
pmd_t entry;
@@ -868,12 +865,11 @@
if (userfaultfd_missing(vma)) {
int ret;
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
mem_cgroup_cancel_charge(page, memcg, true);
put_page(page);
- pte_free(mm, pgtable);
- ret = handle_userfault(vma, address, flags,
- VM_UFFD_MISSING);
+ pte_free(vma->vm_mm, pgtable);
+ ret = handle_userfault(fe, VM_UFFD_MISSING);
VM_BUG_ON(ret & VM_FAULT_FALLBACK);
return ret;
}
@@ -883,11 +879,11 @@
page_add_new_anon_rmap(page, vma, haddr, true);
mem_cgroup_commit_charge(page, memcg, false, true);
lru_cache_add_active_or_unevictable(page, vma);
- pgtable_trans_huge_deposit(mm, pmd, pgtable);
- set_pmd_at(mm, haddr, pmd, entry);
- add_mm_counter(mm, MM_ANONPAGES, HPAGE_PMD_NR);
- atomic_long_inc(&mm->nr_ptes);
- spin_unlock(ptl);
+ pgtable_trans_huge_deposit(vma->vm_mm, fe->pmd, pgtable);
+ set_pmd_at(vma->vm_mm, haddr, fe->pmd, entry);
+ add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR);
+ atomic_long_inc(&vma->vm_mm->nr_ptes);
+ spin_unlock(fe->ptl);
count_vm_event(THP_FAULT_ALLOC);
}
@@ -937,13 +933,12 @@
return true;
}
-int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd,
- unsigned int flags)
+int do_huge_pmd_anonymous_page(struct fault_env *fe)
{
+ struct vm_area_struct *vma = fe->vma;
gfp_t gfp;
struct page *page;
- unsigned long haddr = address & HPAGE_PMD_MASK;
+ unsigned long haddr = fe->address & HPAGE_PMD_MASK;
if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
return VM_FAULT_FALLBACK;
@@ -951,42 +946,40 @@
return VM_FAULT_OOM;
if (unlikely(khugepaged_enter(vma, vma->vm_flags)))
return VM_FAULT_OOM;
- if (!(flags & FAULT_FLAG_WRITE) && !mm_forbids_zeropage(mm) &&
+ if (!(fe->flags & FAULT_FLAG_WRITE) &&
+ !mm_forbids_zeropage(vma->vm_mm) &&
transparent_hugepage_use_zero_page()) {
- spinlock_t *ptl;
pgtable_t pgtable;
struct page *zero_page;
bool set;
int ret;
- pgtable = pte_alloc_one(mm, haddr);
+ pgtable = pte_alloc_one(vma->vm_mm, haddr);
if (unlikely(!pgtable))
return VM_FAULT_OOM;
zero_page = get_huge_zero_page();
if (unlikely(!zero_page)) {
- pte_free(mm, pgtable);
+ pte_free(vma->vm_mm, pgtable);
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
}
- ptl = pmd_lock(mm, pmd);
+ fe->ptl = pmd_lock(vma->vm_mm, fe->pmd);
ret = 0;
set = false;
- if (pmd_none(*pmd)) {
+ if (pmd_none(*fe->pmd)) {
if (userfaultfd_missing(vma)) {
- spin_unlock(ptl);
- ret = handle_userfault(vma, address, flags,
- VM_UFFD_MISSING);
+ spin_unlock(fe->ptl);
+ ret = handle_userfault(fe, VM_UFFD_MISSING);
VM_BUG_ON(ret & VM_FAULT_FALLBACK);
} else {
- set_huge_zero_page(pgtable, mm, vma,
- haddr, pmd,
- zero_page);
- spin_unlock(ptl);
+ set_huge_zero_page(pgtable, vma->vm_mm, vma,
+ haddr, fe->pmd, zero_page);
+ spin_unlock(fe->ptl);
set = true;
}
} else
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
if (!set) {
- pte_free(mm, pgtable);
+ pte_free(vma->vm_mm, pgtable);
put_huge_zero_page();
}
return ret;
@@ -998,8 +991,7 @@
return VM_FAULT_FALLBACK;
}
prep_transhuge_page(page);
- return __do_huge_pmd_anonymous_page(mm, vma, address, pmd, page, gfp,
- flags);
+ return __do_huge_pmd_anonymous_page(fe, page, gfp);
}
static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
@@ -1172,38 +1164,31 @@
return ret;
}
-void huge_pmd_set_accessed(struct mm_struct *mm,
- struct vm_area_struct *vma,
- unsigned long address,
- pmd_t *pmd, pmd_t orig_pmd,
- int dirty)
+void huge_pmd_set_accessed(struct fault_env *fe, pmd_t orig_pmd)
{
- spinlock_t *ptl;
pmd_t entry;
unsigned long haddr;
- ptl = pmd_lock(mm, pmd);
- if (unlikely(!pmd_same(*pmd, orig_pmd)))
+ fe->ptl = pmd_lock(fe->vma->vm_mm, fe->pmd);
+ if (unlikely(!pmd_same(*fe->pmd, orig_pmd)))
goto unlock;
entry = pmd_mkyoung(orig_pmd);
- haddr = address & HPAGE_PMD_MASK;
- if (pmdp_set_access_flags(vma, haddr, pmd, entry, dirty))
- update_mmu_cache_pmd(vma, address, pmd);
+ haddr = fe->address & HPAGE_PMD_MASK;
+ if (pmdp_set_access_flags(fe->vma, haddr, fe->pmd, entry,
+ fe->flags & FAULT_FLAG_WRITE))
+ update_mmu_cache_pmd(fe->vma, fe->address, fe->pmd);
unlock:
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
}
-static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
- struct vm_area_struct *vma,
- unsigned long address,
- pmd_t *pmd, pmd_t orig_pmd,
- struct page *page,
- unsigned long haddr)
+static int do_huge_pmd_wp_page_fallback(struct fault_env *fe, pmd_t orig_pmd,
+ struct page *page)
{
+ struct vm_area_struct *vma = fe->vma;
+ unsigned long haddr = fe->address & HPAGE_PMD_MASK;
struct mem_cgroup *memcg;
- spinlock_t *ptl;
pgtable_t pgtable;
pmd_t _pmd;
int ret = 0, i;
@@ -1220,11 +1205,11 @@
for (i = 0; i < HPAGE_PMD_NR; i++) {
pages[i] = alloc_page_vma_node(GFP_HIGHUSER_MOVABLE |
- __GFP_OTHER_NODE,
- vma, address, page_to_nid(page));
+ __GFP_OTHER_NODE, vma,
+ fe->address, page_to_nid(page));
if (unlikely(!pages[i] ||
- mem_cgroup_try_charge(pages[i], mm, GFP_KERNEL,
- &memcg, false))) {
+ mem_cgroup_try_charge(pages[i], vma->vm_mm,
+ GFP_KERNEL, &memcg, false))) {
if (pages[i])
put_page(pages[i]);
while (--i >= 0) {
@@ -1250,41 +1235,41 @@
mmun_start = haddr;
mmun_end = haddr + HPAGE_PMD_SIZE;
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end);
- ptl = pmd_lock(mm, pmd);
- if (unlikely(!pmd_same(*pmd, orig_pmd)))
+ fe->ptl = pmd_lock(vma->vm_mm, fe->pmd);
+ if (unlikely(!pmd_same(*fe->pmd, orig_pmd)))
goto out_free_pages;
VM_BUG_ON_PAGE(!PageHead(page), page);
- pmdp_huge_clear_flush_notify(vma, haddr, pmd);
+ pmdp_huge_clear_flush_notify(vma, haddr, fe->pmd);
/* leave pmd empty until pte is filled */
- pgtable = pgtable_trans_huge_withdraw(mm, pmd);
- pmd_populate(mm, &_pmd, pgtable);
+ pgtable = pgtable_trans_huge_withdraw(vma->vm_mm, fe->pmd);
+ pmd_populate(vma->vm_mm, &_pmd, pgtable);
for (i = 0; i < HPAGE_PMD_NR; i++, haddr += PAGE_SIZE) {
- pte_t *pte, entry;
+ pte_t entry;
entry = mk_pte(pages[i], vma->vm_page_prot);
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
memcg = (void *)page_private(pages[i]);
set_page_private(pages[i], 0);
- page_add_new_anon_rmap(pages[i], vma, haddr, false);
+ page_add_new_anon_rmap(pages[i], fe->vma, haddr, false);
mem_cgroup_commit_charge(pages[i], memcg, false, false);
lru_cache_add_active_or_unevictable(pages[i], vma);
- pte = pte_offset_map(&_pmd, haddr);
- VM_BUG_ON(!pte_none(*pte));
- set_pte_at(mm, haddr, pte, entry);
- pte_unmap(pte);
+ fe->pte = pte_offset_map(&_pmd, haddr);
+ VM_BUG_ON(!pte_none(*fe->pte));
+ set_pte_at(vma->vm_mm, haddr, fe->pte, entry);
+ pte_unmap(fe->pte);
}
kfree(pages);
smp_wmb(); /* make pte visible before pmd */
- pmd_populate(mm, pmd, pgtable);
+ pmd_populate(vma->vm_mm, fe->pmd, pgtable);
page_remove_rmap(page, true);
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
ret |= VM_FAULT_WRITE;
put_page(page);
@@ -1293,8 +1278,8 @@
return ret;
out_free_pages:
- spin_unlock(ptl);
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ spin_unlock(fe->ptl);
+ mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
for (i = 0; i < HPAGE_PMD_NR; i++) {
memcg = (void *)page_private(pages[i]);
set_page_private(pages[i], 0);
@@ -1305,25 +1290,23 @@
goto out;
}
-int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd, pmd_t orig_pmd)
+int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd)
{
- spinlock_t *ptl;
- int ret = 0;
+ struct vm_area_struct *vma = fe->vma;
struct page *page = NULL, *new_page;
struct mem_cgroup *memcg;
- unsigned long haddr;
+ unsigned long haddr = fe->address & HPAGE_PMD_MASK;
unsigned long mmun_start; /* For mmu_notifiers */
unsigned long mmun_end; /* For mmu_notifiers */
gfp_t huge_gfp; /* for allocation and charge */
+ int ret = 0;
- ptl = pmd_lockptr(mm, pmd);
+ fe->ptl = pmd_lockptr(vma->vm_mm, fe->pmd);
VM_BUG_ON_VMA(!vma->anon_vma, vma);
- haddr = address & HPAGE_PMD_MASK;
if (is_huge_zero_pmd(orig_pmd))
goto alloc;
- spin_lock(ptl);
- if (unlikely(!pmd_same(*pmd, orig_pmd)))
+ spin_lock(fe->ptl);
+ if (unlikely(!pmd_same(*fe->pmd, orig_pmd)))
goto out_unlock;
page = pmd_page(orig_pmd);
@@ -1336,13 +1319,13 @@
pmd_t entry;
entry = pmd_mkyoung(orig_pmd);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
- if (pmdp_set_access_flags(vma, haddr, pmd, entry, 1))
- update_mmu_cache_pmd(vma, address, pmd);
+ if (pmdp_set_access_flags(vma, haddr, fe->pmd, entry, 1))
+ update_mmu_cache_pmd(vma, fe->address, fe->pmd);
ret |= VM_FAULT_WRITE;
goto out_unlock;
}
get_page(page);
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
alloc:
if (transparent_hugepage_enabled(vma) &&
!transparent_hugepage_debug_cow()) {
@@ -1355,13 +1338,12 @@
prep_transhuge_page(new_page);
} else {
if (!page) {
- split_huge_pmd(vma, pmd, address);
+ split_huge_pmd(vma, fe->pmd, fe->address);
ret |= VM_FAULT_FALLBACK;
} else {
- ret = do_huge_pmd_wp_page_fallback(mm, vma, address,
- pmd, orig_pmd, page, haddr);
+ ret = do_huge_pmd_wp_page_fallback(fe, orig_pmd, page);
if (ret & VM_FAULT_OOM) {
- split_huge_pmd(vma, pmd, address);
+ split_huge_pmd(vma, fe->pmd, fe->address);
ret |= VM_FAULT_FALLBACK;
}
put_page(page);
@@ -1370,14 +1352,12 @@
goto out;
}
- if (unlikely(mem_cgroup_try_charge(new_page, mm, huge_gfp, &memcg,
- true))) {
+ if (unlikely(mem_cgroup_try_charge(new_page, vma->vm_mm,
+ huge_gfp, &memcg, true))) {
put_page(new_page);
- if (page) {
- split_huge_pmd(vma, pmd, address);
+ split_huge_pmd(vma, fe->pmd, fe->address);
+ if (page)
put_page(page);
- } else
- split_huge_pmd(vma, pmd, address);
ret |= VM_FAULT_FALLBACK;
count_vm_event(THP_FAULT_FALLBACK);
goto out;
@@ -1393,13 +1373,13 @@
mmun_start = haddr;
mmun_end = haddr + HPAGE_PMD_SIZE;
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end);
- spin_lock(ptl);
+ spin_lock(fe->ptl);
if (page)
put_page(page);
- if (unlikely(!pmd_same(*pmd, orig_pmd))) {
- spin_unlock(ptl);
+ if (unlikely(!pmd_same(*fe->pmd, orig_pmd))) {
+ spin_unlock(fe->ptl);
mem_cgroup_cancel_charge(new_page, memcg, true);
put_page(new_page);
goto out_mn;
@@ -1407,14 +1387,14 @@
pmd_t entry;
entry = mk_huge_pmd(new_page, vma->vm_page_prot);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
- pmdp_huge_clear_flush_notify(vma, haddr, pmd);
+ pmdp_huge_clear_flush_notify(vma, haddr, fe->pmd);
page_add_new_anon_rmap(new_page, vma, haddr, true);
mem_cgroup_commit_charge(new_page, memcg, false, true);
lru_cache_add_active_or_unevictable(new_page, vma);
- set_pmd_at(mm, haddr, pmd, entry);
- update_mmu_cache_pmd(vma, address, pmd);
+ set_pmd_at(vma->vm_mm, haddr, fe->pmd, entry);
+ update_mmu_cache_pmd(vma, fe->address, fe->pmd);
if (!page) {
- add_mm_counter(mm, MM_ANONPAGES, HPAGE_PMD_NR);
+ add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR);
put_huge_zero_page();
} else {
VM_BUG_ON_PAGE(!PageHead(page), page);
@@ -1423,13 +1403,13 @@
}
ret |= VM_FAULT_WRITE;
}
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
out_mn:
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
out:
return ret;
out_unlock:
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
return ret;
}
@@ -1489,13 +1469,12 @@
}
/* NUMA hinting page fault entry point for trans huge pmds */
-int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long addr, pmd_t pmd, pmd_t *pmdp)
+int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t pmd)
{
- spinlock_t *ptl;
+ struct vm_area_struct *vma = fe->vma;
struct anon_vma *anon_vma = NULL;
struct page *page;
- unsigned long haddr = addr & HPAGE_PMD_MASK;
+ unsigned long haddr = fe->address & HPAGE_PMD_MASK;
int page_nid = -1, this_nid = numa_node_id();
int target_nid, last_cpupid = -1;
bool page_locked;
@@ -1506,8 +1485,8 @@
/* A PROT_NONE fault should not end up here */
BUG_ON(!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)));
- ptl = pmd_lock(mm, pmdp);
- if (unlikely(!pmd_same(pmd, *pmdp)))
+ fe->ptl = pmd_lock(vma->vm_mm, fe->pmd);
+ if (unlikely(!pmd_same(pmd, *fe->pmd)))
goto out_unlock;
/*
@@ -1515,9 +1494,9 @@
* without disrupting NUMA hinting information. Do not relock and
* check_same as the page may no longer be mapped.
*/
- if (unlikely(pmd_trans_migrating(*pmdp))) {
- page = pmd_page(*pmdp);
- spin_unlock(ptl);
+ if (unlikely(pmd_trans_migrating(*fe->pmd))) {
+ page = pmd_page(*fe->pmd);
+ spin_unlock(fe->ptl);
wait_on_page_locked(page);
goto out;
}
@@ -1550,7 +1529,7 @@
/* Migration could have started since the pmd_trans_migrating check */
if (!page_locked) {
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
wait_on_page_locked(page);
page_nid = -1;
goto out;
@@ -1561,12 +1540,12 @@
* to serialises splits
*/
get_page(page);
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
anon_vma = page_lock_anon_vma_read(page);
/* Confirm the PMD did not change while page_table_lock was released */
- spin_lock(ptl);
- if (unlikely(!pmd_same(pmd, *pmdp))) {
+ spin_lock(fe->ptl);
+ if (unlikely(!pmd_same(pmd, *fe->pmd))) {
unlock_page(page);
put_page(page);
page_nid = -1;
@@ -1584,9 +1563,9 @@
* Migrate the THP to the requested node, returns with page unlocked
* and access rights restored.
*/
- spin_unlock(ptl);
- migrated = migrate_misplaced_transhuge_page(mm, vma,
- pmdp, pmd, addr, page, target_nid);
+ spin_unlock(fe->ptl);
+ migrated = migrate_misplaced_transhuge_page(vma->vm_mm, vma,
+ fe->pmd, pmd, fe->address, page, target_nid);
if (migrated) {
flags |= TNF_MIGRATED;
page_nid = target_nid;
@@ -1601,18 +1580,18 @@
pmd = pmd_mkyoung(pmd);
if (was_writable)
pmd = pmd_mkwrite(pmd);
- set_pmd_at(mm, haddr, pmdp, pmd);
- update_mmu_cache_pmd(vma, addr, pmdp);
+ set_pmd_at(vma->vm_mm, haddr, fe->pmd, pmd);
+ update_mmu_cache_pmd(vma, fe->address, fe->pmd);
unlock_page(page);
out_unlock:
- spin_unlock(ptl);
+ spin_unlock(fe->ptl);
out:
if (anon_vma)
page_unlock_anon_vma_read(anon_vma);
if (page_nid != -1)
- task_numa_fault(last_cpupid, page_nid, HPAGE_PMD_NR, flags);
+ task_numa_fault(last_cpupid, page_nid, HPAGE_PMD_NR, fe->flags);
return 0;
}
@@ -2413,20 +2392,23 @@
struct vm_area_struct *vma,
unsigned long address, pmd_t *pmd)
{
- unsigned long _address;
- pte_t *pte, pteval;
+ pte_t pteval;
int swapped_in = 0, ret = 0;
+ struct fault_env fe = {
+ .vma = vma,
+ .address = address,
+ .flags = FAULT_FLAG_ALLOW_RETRY,
+ .pmd = pmd,
+ };
- pte = pte_offset_map(pmd, address);
- for (_address = address; _address < address + HPAGE_PMD_NR*PAGE_SIZE;
- pte++, _address += PAGE_SIZE) {
- pteval = *pte;
+ fe.pte = pte_offset_map(pmd, address);
+ for (; fe.address < address + HPAGE_PMD_NR*PAGE_SIZE;
+ fe.pte++, fe.address += PAGE_SIZE) {
+ pteval = *fe.pte;
if (!is_swap_pte(pteval))
continue;
swapped_in++;
- ret = do_swap_page(mm, vma, _address, pte, pmd,
- FAULT_FLAG_ALLOW_RETRY,
- pteval);
+ ret = do_swap_page(&fe, pteval);
/* do_swap_page returns VM_FAULT_RETRY with released mmap_sem */
if (ret & VM_FAULT_RETRY) {
down_read(&mm->mmap_sem);
@@ -2442,10 +2424,10 @@
return false;
}
/* pte is unmapped now, we need to map it */
- pte = pte_offset_map(pmd, _address);
+ fe.pte = pte_offset_map(pmd, fe.address);
}
- pte--;
- pte_unmap(pte);
+ fe.pte--;
+ pte_unmap(fe.pte);
trace_mm_collapse_huge_page_swapin(mm, swapped_in, 1);
return true;
}
diff --git a/mm/internal.h b/mm/internal.h
index e153175..9b6a6c43 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -36,9 +36,7 @@
/* Do not use these with a slab allocator */
#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
-extern int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pte_t *page_table, pmd_t *pmd,
- unsigned int flags, pte_t orig_pte);
+int do_swap_page(struct fault_env *fe, pte_t orig_pte);
void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long floor, unsigned long ceiling);
diff --git a/mm/memory.c b/mm/memory.c
index 6bf2b85..72b5208 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2070,13 +2070,11 @@
* case, all we need to do here is to mark the page as writable and update
* any related book-keeping.
*/
-static inline int wp_page_reuse(struct mm_struct *mm,
- struct vm_area_struct *vma, unsigned long address,
- pte_t *page_table, spinlock_t *ptl, pte_t orig_pte,
- struct page *page, int page_mkwrite,
- int dirty_shared)
- __releases(ptl)
+static inline int wp_page_reuse(struct fault_env *fe, pte_t orig_pte,
+ struct page *page, int page_mkwrite, int dirty_shared)
+ __releases(fe->ptl)
{
+ struct vm_area_struct *vma = fe->vma;
pte_t entry;
/*
* Clear the pages cpupid information as the existing
@@ -2086,12 +2084,12 @@
if (page)
page_cpupid_xchg_last(page, (1 << LAST_CPUPID_SHIFT) - 1);
- flush_cache_page(vma, address, pte_pfn(orig_pte));
+ flush_cache_page(vma, fe->address, pte_pfn(orig_pte));
entry = pte_mkyoung(orig_pte);
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
- if (ptep_set_access_flags(vma, address, page_table, entry, 1))
- update_mmu_cache(vma, address, page_table);
- pte_unmap_unlock(page_table, ptl);
+ if (ptep_set_access_flags(vma, fe->address, fe->pte, entry, 1))
+ update_mmu_cache(vma, fe->address, fe->pte);
+ pte_unmap_unlock(fe->pte, fe->ptl);
if (dirty_shared) {
struct address_space *mapping;
@@ -2137,30 +2135,31 @@
* held to the old page, as well as updating the rmap.
* - In any case, unlock the PTL and drop the reference we took to the old page.
*/
-static int wp_page_copy(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pte_t *page_table, pmd_t *pmd,
- pte_t orig_pte, struct page *old_page)
+static int wp_page_copy(struct fault_env *fe, pte_t orig_pte,
+ struct page *old_page)
{
+ struct vm_area_struct *vma = fe->vma;
+ struct mm_struct *mm = vma->vm_mm;
struct page *new_page = NULL;
- spinlock_t *ptl = NULL;
pte_t entry;
int page_copied = 0;
- const unsigned long mmun_start = address & PAGE_MASK; /* For mmu_notifiers */
- const unsigned long mmun_end = mmun_start + PAGE_SIZE; /* For mmu_notifiers */
+ const unsigned long mmun_start = fe->address & PAGE_MASK;
+ const unsigned long mmun_end = mmun_start + PAGE_SIZE;
struct mem_cgroup *memcg;
if (unlikely(anon_vma_prepare(vma)))
goto oom;
if (is_zero_pfn(pte_pfn(orig_pte))) {
- new_page = alloc_zeroed_user_highpage_movable(vma, address);
+ new_page = alloc_zeroed_user_highpage_movable(vma, fe->address);
if (!new_page)
goto oom;
} else {
- new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
+ new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma,
+ fe->address);
if (!new_page)
goto oom;
- cow_user_page(new_page, old_page, address, vma);
+ cow_user_page(new_page, old_page, fe->address, vma);
}
if (mem_cgroup_try_charge(new_page, mm, GFP_KERNEL, &memcg, false))
@@ -2173,8 +2172,8 @@
/*
* Re-check the pte - we dropped the lock
*/
- page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
- if (likely(pte_same(*page_table, orig_pte))) {
+ fe->pte = pte_offset_map_lock(mm, fe->pmd, fe->address, &fe->ptl);
+ if (likely(pte_same(*fe->pte, orig_pte))) {
if (old_page) {
if (!PageAnon(old_page)) {
dec_mm_counter_fast(mm,
@@ -2184,7 +2183,7 @@
} else {
inc_mm_counter_fast(mm, MM_ANONPAGES);
}
- flush_cache_page(vma, address, pte_pfn(orig_pte));
+ flush_cache_page(vma, fe->address, pte_pfn(orig_pte));
entry = mk_pte(new_page, vma->vm_page_prot);
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
/*
@@ -2193,8 +2192,8 @@
* seen in the presence of one thread doing SMC and another
* thread doing COW.
*/
- ptep_clear_flush_notify(vma, address, page_table);
- page_add_new_anon_rmap(new_page, vma, address, false);
+ ptep_clear_flush_notify(vma, fe->address, fe->pte);
+ page_add_new_anon_rmap(new_page, vma, fe->address, false);
mem_cgroup_commit_charge(new_page, memcg, false, false);
lru_cache_add_active_or_unevictable(new_page, vma);
/*
@@ -2202,8 +2201,8 @@
* mmu page tables (such as kvm shadow page tables), we want the
* new page to be mapped directly into the secondary page table.
*/
- set_pte_at_notify(mm, address, page_table, entry);
- update_mmu_cache(vma, address, page_table);
+ set_pte_at_notify(mm, fe->address, fe->pte, entry);
+ update_mmu_cache(vma, fe->address, fe->pte);
if (old_page) {
/*
* Only after switching the pte to the new page may
@@ -2240,7 +2239,7 @@
if (new_page)
put_page(new_page);
- pte_unmap_unlock(page_table, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
if (old_page) {
/*
@@ -2268,44 +2267,43 @@
* Handle write page faults for VM_MIXEDMAP or VM_PFNMAP for a VM_SHARED
* mapping
*/
-static int wp_pfn_shared(struct mm_struct *mm,
- struct vm_area_struct *vma, unsigned long address,
- pte_t *page_table, spinlock_t *ptl, pte_t orig_pte,
- pmd_t *pmd)
+static int wp_pfn_shared(struct fault_env *fe, pte_t orig_pte)
{
+ struct vm_area_struct *vma = fe->vma;
+
if (vma->vm_ops && vma->vm_ops->pfn_mkwrite) {
struct vm_fault vmf = {
.page = NULL,
- .pgoff = linear_page_index(vma, address),
- .virtual_address = (void __user *)(address & PAGE_MASK),
+ .pgoff = linear_page_index(vma, fe->address),
+ .virtual_address =
+ (void __user *)(fe->address & PAGE_MASK),
.flags = FAULT_FLAG_WRITE | FAULT_FLAG_MKWRITE,
};
int ret;
- pte_unmap_unlock(page_table, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
ret = vma->vm_ops->pfn_mkwrite(vma, &vmf);
if (ret & VM_FAULT_ERROR)
return ret;
- page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd, fe->address,
+ &fe->ptl);
/*
* We might have raced with another page fault while we
* released the pte_offset_map_lock.
*/
- if (!pte_same(*page_table, orig_pte)) {
- pte_unmap_unlock(page_table, ptl);
+ if (!pte_same(*fe->pte, orig_pte)) {
+ pte_unmap_unlock(fe->pte, fe->ptl);
return 0;
}
}
- return wp_page_reuse(mm, vma, address, page_table, ptl, orig_pte,
- NULL, 0, 0);
+ return wp_page_reuse(fe, orig_pte, NULL, 0, 0);
}
-static int wp_page_shared(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pte_t *page_table,
- pmd_t *pmd, spinlock_t *ptl, pte_t orig_pte,
- struct page *old_page)
- __releases(ptl)
+static int wp_page_shared(struct fault_env *fe, pte_t orig_pte,
+ struct page *old_page)
+ __releases(fe->ptl)
{
+ struct vm_area_struct *vma = fe->vma;
int page_mkwrite = 0;
get_page(old_page);
@@ -2313,8 +2311,8 @@
if (vma->vm_ops && vma->vm_ops->page_mkwrite) {
int tmp;
- pte_unmap_unlock(page_table, ptl);
- tmp = do_page_mkwrite(vma, old_page, address);
+ pte_unmap_unlock(fe->pte, fe->ptl);
+ tmp = do_page_mkwrite(vma, old_page, fe->address);
if (unlikely(!tmp || (tmp &
(VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
put_page(old_page);
@@ -2326,19 +2324,18 @@
* they did, we just return, as we can count on the
* MMU to tell us if they didn't also make it writable.
*/
- page_table = pte_offset_map_lock(mm, pmd, address,
- &ptl);
- if (!pte_same(*page_table, orig_pte)) {
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd, fe->address,
+ &fe->ptl);
+ if (!pte_same(*fe->pte, orig_pte)) {
unlock_page(old_page);
- pte_unmap_unlock(page_table, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
put_page(old_page);
return 0;
}
page_mkwrite = 1;
}
- return wp_page_reuse(mm, vma, address, page_table, ptl,
- orig_pte, old_page, page_mkwrite, 1);
+ return wp_page_reuse(fe, orig_pte, old_page, page_mkwrite, 1);
}
/*
@@ -2359,14 +2356,13 @@
* but allow concurrent faults), with pte both mapped and locked.
* We return with mmap_sem still held, but pte unmapped and unlocked.
*/
-static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pte_t *page_table, pmd_t *pmd,
- spinlock_t *ptl, pte_t orig_pte)
- __releases(ptl)
+static int do_wp_page(struct fault_env *fe, pte_t orig_pte)
+ __releases(fe->ptl)
{
+ struct vm_area_struct *vma = fe->vma;
struct page *old_page;
- old_page = vm_normal_page(vma, address, orig_pte);
+ old_page = vm_normal_page(vma, fe->address, orig_pte);
if (!old_page) {
/*
* VM_MIXEDMAP !pfn_valid() case, or VM_SOFTDIRTY clear on a
@@ -2377,12 +2373,10 @@
*/
if ((vma->vm_flags & (VM_WRITE|VM_SHARED)) ==
(VM_WRITE|VM_SHARED))
- return wp_pfn_shared(mm, vma, address, page_table, ptl,
- orig_pte, pmd);
+ return wp_pfn_shared(fe, orig_pte);
- pte_unmap_unlock(page_table, ptl);
- return wp_page_copy(mm, vma, address, page_table, pmd,
- orig_pte, old_page);
+ pte_unmap_unlock(fe->pte, fe->ptl);
+ return wp_page_copy(fe, orig_pte, old_page);
}
/*
@@ -2393,13 +2387,13 @@
int total_mapcount;
if (!trylock_page(old_page)) {
get_page(old_page);
- pte_unmap_unlock(page_table, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
lock_page(old_page);
- page_table = pte_offset_map_lock(mm, pmd, address,
- &ptl);
- if (!pte_same(*page_table, orig_pte)) {
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd,
+ fe->address, &fe->ptl);
+ if (!pte_same(*fe->pte, orig_pte)) {
unlock_page(old_page);
- pte_unmap_unlock(page_table, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
put_page(old_page);
return 0;
}
@@ -2417,14 +2411,12 @@
page_move_anon_rmap(old_page, vma);
}
unlock_page(old_page);
- return wp_page_reuse(mm, vma, address, page_table, ptl,
- orig_pte, old_page, 0, 0);
+ return wp_page_reuse(fe, orig_pte, old_page, 0, 0);
}
unlock_page(old_page);
} else if (unlikely((vma->vm_flags & (VM_WRITE|VM_SHARED)) ==
(VM_WRITE|VM_SHARED))) {
- return wp_page_shared(mm, vma, address, page_table, pmd,
- ptl, orig_pte, old_page);
+ return wp_page_shared(fe, orig_pte, old_page);
}
/*
@@ -2432,9 +2424,8 @@
*/
get_page(old_page);
- pte_unmap_unlock(page_table, ptl);
- return wp_page_copy(mm, vma, address, page_table, pmd,
- orig_pte, old_page);
+ pte_unmap_unlock(fe->pte, fe->ptl);
+ return wp_page_copy(fe, orig_pte, old_page);
}
static void unmap_mapping_range_vma(struct vm_area_struct *vma,
@@ -2522,11 +2513,9 @@
* We return with the mmap_sem locked or unlocked in the same cases
* as does filemap_fault().
*/
-int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pte_t *page_table, pmd_t *pmd,
- unsigned int flags, pte_t orig_pte)
+int do_swap_page(struct fault_env *fe, pte_t orig_pte)
{
- spinlock_t *ptl;
+ struct vm_area_struct *vma = fe->vma;
struct page *page, *swapcache;
struct mem_cgroup *memcg;
swp_entry_t entry;
@@ -2535,17 +2524,17 @@
int exclusive = 0;
int ret = 0;
- if (!pte_unmap_same(mm, pmd, page_table, orig_pte))
+ if (!pte_unmap_same(vma->vm_mm, fe->pmd, fe->pte, orig_pte))
goto out;
entry = pte_to_swp_entry(orig_pte);
if (unlikely(non_swap_entry(entry))) {
if (is_migration_entry(entry)) {
- migration_entry_wait(mm, pmd, address);
+ migration_entry_wait(vma->vm_mm, fe->pmd, fe->address);
} else if (is_hwpoison_entry(entry)) {
ret = VM_FAULT_HWPOISON;
} else {
- print_bad_pte(vma, address, orig_pte, NULL);
+ print_bad_pte(vma, fe->address, orig_pte, NULL);
ret = VM_FAULT_SIGBUS;
}
goto out;
@@ -2554,14 +2543,15 @@
page = lookup_swap_cache(entry);
if (!page) {
page = swapin_readahead(entry,
- GFP_HIGHUSER_MOVABLE, vma, address);
+ GFP_HIGHUSER_MOVABLE, vma, fe->address);
if (!page) {
/*
* Back out if somebody else faulted in this pte
* while we released the pte lock.
*/
- page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
- if (likely(pte_same(*page_table, orig_pte)))
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd,
+ fe->address, &fe->ptl);
+ if (likely(pte_same(*fe->pte, orig_pte)))
ret = VM_FAULT_OOM;
delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
goto unlock;
@@ -2570,7 +2560,7 @@
/* Had to read the page from swap area: Major fault */
ret = VM_FAULT_MAJOR;
count_vm_event(PGMAJFAULT);
- mem_cgroup_count_vm_event(mm, PGMAJFAULT);
+ mem_cgroup_count_vm_event(vma->vm_mm, PGMAJFAULT);
} else if (PageHWPoison(page)) {
/*
* hwpoisoned dirty swapcache pages are kept for killing
@@ -2583,7 +2573,7 @@
}
swapcache = page;
- locked = lock_page_or_retry(page, mm, flags);
+ locked = lock_page_or_retry(page, vma->vm_mm, fe->flags);
delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
if (!locked) {
@@ -2600,14 +2590,15 @@
if (unlikely(!PageSwapCache(page) || page_private(page) != entry.val))
goto out_page;
- page = ksm_might_need_to_copy(page, vma, address);
+ page = ksm_might_need_to_copy(page, vma, fe->address);
if (unlikely(!page)) {
ret = VM_FAULT_OOM;
page = swapcache;
goto out_page;
}
- if (mem_cgroup_try_charge(page, mm, GFP_KERNEL, &memcg, false)) {
+ if (mem_cgroup_try_charge(page, vma->vm_mm, GFP_KERNEL,
+ &memcg, false)) {
ret = VM_FAULT_OOM;
goto out_page;
}
@@ -2615,8 +2606,9 @@
/*
* Back out if somebody else already faulted in this pte.
*/
- page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
- if (unlikely(!pte_same(*page_table, orig_pte)))
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd, fe->address,
+ &fe->ptl);
+ if (unlikely(!pte_same(*fe->pte, orig_pte)))
goto out_nomap;
if (unlikely(!PageUptodate(page))) {
@@ -2634,24 +2626,24 @@
* must be called after the swap_free(), or it will never succeed.
*/
- inc_mm_counter_fast(mm, MM_ANONPAGES);
- dec_mm_counter_fast(mm, MM_SWAPENTS);
+ inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
+ dec_mm_counter_fast(vma->vm_mm, MM_SWAPENTS);
pte = mk_pte(page, vma->vm_page_prot);
- if ((flags & FAULT_FLAG_WRITE) && reuse_swap_page(page, NULL)) {
+ if ((fe->flags & FAULT_FLAG_WRITE) && reuse_swap_page(page, NULL)) {
pte = maybe_mkwrite(pte_mkdirty(pte), vma);
- flags &= ~FAULT_FLAG_WRITE;
+ fe->flags &= ~FAULT_FLAG_WRITE;
ret |= VM_FAULT_WRITE;
exclusive = RMAP_EXCLUSIVE;
}
flush_icache_page(vma, page);
if (pte_swp_soft_dirty(orig_pte))
pte = pte_mksoft_dirty(pte);
- set_pte_at(mm, address, page_table, pte);
+ set_pte_at(vma->vm_mm, fe->address, fe->pte, pte);
if (page == swapcache) {
- do_page_add_anon_rmap(page, vma, address, exclusive);
+ do_page_add_anon_rmap(page, vma, fe->address, exclusive);
mem_cgroup_commit_charge(page, memcg, true, false);
} else { /* ksm created a completely new copy */
- page_add_new_anon_rmap(page, vma, address, false);
+ page_add_new_anon_rmap(page, vma, fe->address, false);
mem_cgroup_commit_charge(page, memcg, false, false);
lru_cache_add_active_or_unevictable(page, vma);
}
@@ -2674,22 +2666,22 @@
put_page(swapcache);
}
- if (flags & FAULT_FLAG_WRITE) {
- ret |= do_wp_page(mm, vma, address, page_table, pmd, ptl, pte);
+ if (fe->flags & FAULT_FLAG_WRITE) {
+ ret |= do_wp_page(fe, pte);
if (ret & VM_FAULT_ERROR)
ret &= VM_FAULT_ERROR;
goto out;
}
/* No need to invalidate - it was non-present before */
- update_mmu_cache(vma, address, page_table);
+ update_mmu_cache(vma, fe->address, fe->pte);
unlock:
- pte_unmap_unlock(page_table, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
out:
return ret;
out_nomap:
mem_cgroup_cancel_charge(page, memcg, false);
- pte_unmap_unlock(page_table, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
out_page:
unlock_page(page);
out_release:
@@ -2740,37 +2732,36 @@
* but allow concurrent faults), and pte mapped but not yet locked.
* We return with mmap_sem still held, but pte unmapped and unlocked.
*/
-static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pte_t *page_table, pmd_t *pmd,
- unsigned int flags)
+static int do_anonymous_page(struct fault_env *fe)
{
+ struct vm_area_struct *vma = fe->vma;
struct mem_cgroup *memcg;
struct page *page;
- spinlock_t *ptl;
pte_t entry;
- pte_unmap(page_table);
+ pte_unmap(fe->pte);
/* File mapping without ->vm_ops ? */
if (vma->vm_flags & VM_SHARED)
return VM_FAULT_SIGBUS;
/* Check if we need to add a guard page to the stack */
- if (check_stack_guard_page(vma, address) < 0)
+ if (check_stack_guard_page(vma, fe->address) < 0)
return VM_FAULT_SIGSEGV;
/* Use the zero-page for reads */
- if (!(flags & FAULT_FLAG_WRITE) && !mm_forbids_zeropage(mm)) {
- entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
+ if (!(fe->flags & FAULT_FLAG_WRITE) &&
+ !mm_forbids_zeropage(vma->vm_mm)) {
+ entry = pte_mkspecial(pfn_pte(my_zero_pfn(fe->address),
vma->vm_page_prot));
- page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
- if (!pte_none(*page_table))
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd, fe->address,
+ &fe->ptl);
+ if (!pte_none(*fe->pte))
goto unlock;
/* Deliver the page fault to userland, check inside PT lock */
if (userfaultfd_missing(vma)) {
- pte_unmap_unlock(page_table, ptl);
- return handle_userfault(vma, address, flags,
- VM_UFFD_MISSING);
+ pte_unmap_unlock(fe->pte, fe->ptl);
+ return handle_userfault(fe, VM_UFFD_MISSING);
}
goto setpte;
}
@@ -2778,11 +2769,11 @@
/* Allocate our own private page. */
if (unlikely(anon_vma_prepare(vma)))
goto oom;
- page = alloc_zeroed_user_highpage_movable(vma, address);
+ page = alloc_zeroed_user_highpage_movable(vma, fe->address);
if (!page)
goto oom;
- if (mem_cgroup_try_charge(page, mm, GFP_KERNEL, &memcg, false))
+ if (mem_cgroup_try_charge(page, vma->vm_mm, GFP_KERNEL, &memcg, false))
goto oom_free_page;
/*
@@ -2796,30 +2787,30 @@
if (vma->vm_flags & VM_WRITE)
entry = pte_mkwrite(pte_mkdirty(entry));
- page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
- if (!pte_none(*page_table))
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd, fe->address,
+ &fe->ptl);
+ if (!pte_none(*fe->pte))
goto release;
/* Deliver the page fault to userland, check inside PT lock */
if (userfaultfd_missing(vma)) {
- pte_unmap_unlock(page_table, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
mem_cgroup_cancel_charge(page, memcg, false);
put_page(page);
- return handle_userfault(vma, address, flags,
- VM_UFFD_MISSING);
+ return handle_userfault(fe, VM_UFFD_MISSING);
}
- inc_mm_counter_fast(mm, MM_ANONPAGES);
- page_add_new_anon_rmap(page, vma, address, false);
+ inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
+ page_add_new_anon_rmap(page, vma, fe->address, false);
mem_cgroup_commit_charge(page, memcg, false, false);
lru_cache_add_active_or_unevictable(page, vma);
setpte:
- set_pte_at(mm, address, page_table, entry);
+ set_pte_at(vma->vm_mm, fe->address, fe->pte, entry);
/* No need to invalidate - it was non-present before */
- update_mmu_cache(vma, address, page_table);
+ update_mmu_cache(vma, fe->address, fe->pte);
unlock:
- pte_unmap_unlock(page_table, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
return 0;
release:
mem_cgroup_cancel_charge(page, memcg, false);
@@ -2836,17 +2827,16 @@
* released depending on flags and vma->vm_ops->fault() return value.
* See filemap_fault() and __lock_page_retry().
*/
-static int __do_fault(struct vm_area_struct *vma, unsigned long address,
- pgoff_t pgoff, unsigned int flags,
- struct page *cow_page, struct page **page,
- void **entry)
+static int __do_fault(struct fault_env *fe, pgoff_t pgoff,
+ struct page *cow_page, struct page **page, void **entry)
{
+ struct vm_area_struct *vma = fe->vma;
struct vm_fault vmf;
int ret;
- vmf.virtual_address = (void __user *)(address & PAGE_MASK);
+ vmf.virtual_address = (void __user *)(fe->address & PAGE_MASK);
vmf.pgoff = pgoff;
- vmf.flags = flags;
+ vmf.flags = fe->flags;
vmf.page = NULL;
vmf.gfp_mask = __get_fault_gfp_mask(vma);
vmf.cow_page = cow_page;
@@ -2878,38 +2868,36 @@
/**
* do_set_pte - setup new PTE entry for given page and add reverse page mapping.
*
- * @vma: virtual memory area
- * @address: user virtual address
+ * @fe: fault environment
* @page: page to map
- * @pte: pointer to target page table entry
- * @write: true, if new entry is writable
- * @anon: true, if it's anonymous page
*
- * Caller must hold page table lock relevant for @pte.
+ * Caller must hold page table lock relevant for @fe->pte.
*
* Target users are page handler itself and implementations of
* vm_ops->map_pages.
*/
-void do_set_pte(struct vm_area_struct *vma, unsigned long address,
- struct page *page, pte_t *pte, bool write, bool anon)
+void do_set_pte(struct fault_env *fe, struct page *page)
{
+ struct vm_area_struct *vma = fe->vma;
+ bool write = fe->flags & FAULT_FLAG_WRITE;
pte_t entry;
flush_icache_page(vma, page);
entry = mk_pte(page, vma->vm_page_prot);
if (write)
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
- if (anon) {
+ /* copy-on-write page */
+ if (write && !(vma->vm_flags & VM_SHARED)) {
inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
- page_add_new_anon_rmap(page, vma, address, false);
+ page_add_new_anon_rmap(page, vma, fe->address, false);
} else {
inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page));
page_add_file_rmap(page);
}
- set_pte_at(vma->vm_mm, address, pte, entry);
+ set_pte_at(vma->vm_mm, fe->address, fe->pte, entry);
/* no need to invalidate: a not-present page won't be cached */
- update_mmu_cache(vma, address, pte);
+ update_mmu_cache(vma, fe->address, fe->pte);
}
static unsigned long fault_around_bytes __read_mostly =
@@ -2976,57 +2964,53 @@
* fault_around_pages() value (and therefore to page order). This way it's
* easier to guarantee that we don't cross page table boundaries.
*/
-static void do_fault_around(struct vm_area_struct *vma, unsigned long address,
- pte_t *pte, pgoff_t pgoff, unsigned int flags)
+static void do_fault_around(struct fault_env *fe, pgoff_t start_pgoff)
{
- unsigned long start_addr, nr_pages, mask;
- pgoff_t max_pgoff;
- struct vm_fault vmf;
+ unsigned long address = fe->address, start_addr, nr_pages, mask;
+ pte_t *pte = fe->pte;
+ pgoff_t end_pgoff;
int off;
nr_pages = READ_ONCE(fault_around_bytes) >> PAGE_SHIFT;
mask = ~(nr_pages * PAGE_SIZE - 1) & PAGE_MASK;
- start_addr = max(address & mask, vma->vm_start);
- off = ((address - start_addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
- pte -= off;
- pgoff -= off;
+ start_addr = max(fe->address & mask, fe->vma->vm_start);
+ off = ((fe->address - start_addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
+ fe->pte -= off;
+ start_pgoff -= off;
/*
- * max_pgoff is either end of page table or end of vma
- * or fault_around_pages() from pgoff, depending what is nearest.
+ * end_pgoff is either end of page table or end of vma
+ * or fault_around_pages() from start_pgoff, depending what is nearest.
*/
- max_pgoff = pgoff - ((start_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +
+ end_pgoff = start_pgoff -
+ ((start_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +
PTRS_PER_PTE - 1;
- max_pgoff = min3(max_pgoff, vma_pages(vma) + vma->vm_pgoff - 1,
- pgoff + nr_pages - 1);
+ end_pgoff = min3(end_pgoff, vma_pages(fe->vma) + fe->vma->vm_pgoff - 1,
+ start_pgoff + nr_pages - 1);
/* Check if it makes any sense to call ->map_pages */
- while (!pte_none(*pte)) {
- if (++pgoff > max_pgoff)
- return;
- start_addr += PAGE_SIZE;
- if (start_addr >= vma->vm_end)
- return;
- pte++;
+ fe->address = start_addr;
+ while (!pte_none(*fe->pte)) {
+ if (++start_pgoff > end_pgoff)
+ goto out;
+ fe->address += PAGE_SIZE;
+ if (fe->address >= fe->vma->vm_end)
+ goto out;
+ fe->pte++;
}
- vmf.virtual_address = (void __user *) start_addr;
- vmf.pte = pte;
- vmf.pgoff = pgoff;
- vmf.max_pgoff = max_pgoff;
- vmf.flags = flags;
- vmf.gfp_mask = __get_fault_gfp_mask(vma);
- vma->vm_ops->map_pages(vma, &vmf);
+ fe->vma->vm_ops->map_pages(fe, start_pgoff, end_pgoff);
+out:
+ /* restore fault_env */
+ fe->pte = pte;
+ fe->address = address;
}
-static int do_read_fault(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd,
- pgoff_t pgoff, unsigned int flags, pte_t orig_pte)
+static int do_read_fault(struct fault_env *fe, pgoff_t pgoff, pte_t orig_pte)
{
+ struct vm_area_struct *vma = fe->vma;
struct page *fault_page;
- spinlock_t *ptl;
- pte_t *pte;
int ret = 0;
/*
@@ -3035,66 +3019,68 @@
* something).
*/
if (vma->vm_ops->map_pages && fault_around_bytes >> PAGE_SHIFT > 1) {
- pte = pte_offset_map_lock(mm, pmd, address, &ptl);
- do_fault_around(vma, address, pte, pgoff, flags);
- if (!pte_same(*pte, orig_pte))
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd, fe->address,
+ &fe->ptl);
+ if (!pte_same(*fe->pte, orig_pte))
goto unlock_out;
- pte_unmap_unlock(pte, ptl);
+ do_fault_around(fe, pgoff);
+ /* Check if the fault is handled by faultaround */
+ if (!pte_same(*fe->pte, orig_pte))
+ goto unlock_out;
+ pte_unmap_unlock(fe->pte, fe->ptl);
}
- ret = __do_fault(vma, address, pgoff, flags, NULL, &fault_page, NULL);
+ ret = __do_fault(fe, pgoff, NULL, &fault_page, NULL);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
return ret;
- pte = pte_offset_map_lock(mm, pmd, address, &ptl);
- if (unlikely(!pte_same(*pte, orig_pte))) {
- pte_unmap_unlock(pte, ptl);
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd, fe->address, &fe->ptl);
+ if (unlikely(!pte_same(*fe->pte, orig_pte))) {
+ pte_unmap_unlock(fe->pte, fe->ptl);
unlock_page(fault_page);
put_page(fault_page);
return ret;
}
- do_set_pte(vma, address, fault_page, pte, false, false);
+ do_set_pte(fe, fault_page);
unlock_page(fault_page);
unlock_out:
- pte_unmap_unlock(pte, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
return ret;
}
-static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd,
- pgoff_t pgoff, unsigned int flags, pte_t orig_pte)
+static int do_cow_fault(struct fault_env *fe, pgoff_t pgoff, pte_t orig_pte)
{
+ struct vm_area_struct *vma = fe->vma;
struct page *fault_page, *new_page;
void *fault_entry;
struct mem_cgroup *memcg;
- spinlock_t *ptl;
- pte_t *pte;
int ret;
if (unlikely(anon_vma_prepare(vma)))
return VM_FAULT_OOM;
- new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
+ new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, fe->address);
if (!new_page)
return VM_FAULT_OOM;
- if (mem_cgroup_try_charge(new_page, mm, GFP_KERNEL, &memcg, false)) {
+ if (mem_cgroup_try_charge(new_page, vma->vm_mm, GFP_KERNEL,
+ &memcg, false)) {
put_page(new_page);
return VM_FAULT_OOM;
}
- ret = __do_fault(vma, address, pgoff, flags, new_page, &fault_page,
- &fault_entry);
+ ret = __do_fault(fe, pgoff, new_page, &fault_page, &fault_entry);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
goto uncharge_out;
if (!(ret & VM_FAULT_DAX_LOCKED))
- copy_user_highpage(new_page, fault_page, address, vma);
+ copy_user_highpage(new_page, fault_page, fe->address, vma);
__SetPageUptodate(new_page);
- pte = pte_offset_map_lock(mm, pmd, address, &ptl);
- if (unlikely(!pte_same(*pte, orig_pte))) {
- pte_unmap_unlock(pte, ptl);
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd, fe->address,
+ &fe->ptl);
+ if (unlikely(!pte_same(*fe->pte, orig_pte))) {
+ pte_unmap_unlock(fe->pte, fe->ptl);
if (!(ret & VM_FAULT_DAX_LOCKED)) {
unlock_page(fault_page);
put_page(fault_page);
@@ -3104,10 +3090,10 @@
}
goto uncharge_out;
}
- do_set_pte(vma, address, new_page, pte, true, true);
+ do_set_pte(fe, new_page);
mem_cgroup_commit_charge(new_page, memcg, false, false);
lru_cache_add_active_or_unevictable(new_page, vma);
- pte_unmap_unlock(pte, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
if (!(ret & VM_FAULT_DAX_LOCKED)) {
unlock_page(fault_page);
put_page(fault_page);
@@ -3121,18 +3107,15 @@
return ret;
}
-static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd,
- pgoff_t pgoff, unsigned int flags, pte_t orig_pte)
+static int do_shared_fault(struct fault_env *fe, pgoff_t pgoff, pte_t orig_pte)
{
+ struct vm_area_struct *vma = fe->vma;
struct page *fault_page;
struct address_space *mapping;
- spinlock_t *ptl;
- pte_t *pte;
int dirtied = 0;
int ret, tmp;
- ret = __do_fault(vma, address, pgoff, flags, NULL, &fault_page, NULL);
+ ret = __do_fault(fe, pgoff, NULL, &fault_page, NULL);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
return ret;
@@ -3142,7 +3125,7 @@
*/
if (vma->vm_ops->page_mkwrite) {
unlock_page(fault_page);
- tmp = do_page_mkwrite(vma, fault_page, address);
+ tmp = do_page_mkwrite(vma, fault_page, fe->address);
if (unlikely(!tmp ||
(tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
put_page(fault_page);
@@ -3150,15 +3133,16 @@
}
}
- pte = pte_offset_map_lock(mm, pmd, address, &ptl);
- if (unlikely(!pte_same(*pte, orig_pte))) {
- pte_unmap_unlock(pte, ptl);
+ fe->pte = pte_offset_map_lock(vma->vm_mm, fe->pmd, fe->address,
+ &fe->ptl);
+ if (unlikely(!pte_same(*fe->pte, orig_pte))) {
+ pte_unmap_unlock(fe->pte, fe->ptl);
unlock_page(fault_page);
put_page(fault_page);
return ret;
}
- do_set_pte(vma, address, fault_page, pte, true, false);
- pte_unmap_unlock(pte, ptl);
+ do_set_pte(fe, fault_page);
+ pte_unmap_unlock(fe->pte, fe->ptl);
if (set_page_dirty(fault_page))
dirtied = 1;
@@ -3190,23 +3174,20 @@
* The mmap_sem may have been released depending on flags and our
* return value. See filemap_fault() and __lock_page_or_retry().
*/
-static int do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pte_t *page_table, pmd_t *pmd,
- unsigned int flags, pte_t orig_pte)
+static int do_fault(struct fault_env *fe, pte_t orig_pte)
{
- pgoff_t pgoff = linear_page_index(vma, address);
+ struct vm_area_struct *vma = fe->vma;
+ pgoff_t pgoff = linear_page_index(vma, fe->address);
- pte_unmap(page_table);
+ pte_unmap(fe->pte);
/* The VMA was not fully populated on mmap() or missing VM_DONTEXPAND */
if (!vma->vm_ops->fault)
return VM_FAULT_SIGBUS;
- if (!(flags & FAULT_FLAG_WRITE))
- return do_read_fault(mm, vma, address, pmd, pgoff, flags,
- orig_pte);
+ if (!(fe->flags & FAULT_FLAG_WRITE))
+ return do_read_fault(fe, pgoff, orig_pte);
if (!(vma->vm_flags & VM_SHARED))
- return do_cow_fault(mm, vma, address, pmd, pgoff, flags,
- orig_pte);
- return do_shared_fault(mm, vma, address, pmd, pgoff, flags, orig_pte);
+ return do_cow_fault(fe, pgoff, orig_pte);
+ return do_shared_fault(fe, pgoff, orig_pte);
}
static int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
@@ -3224,11 +3205,10 @@
return mpol_misplaced(page, vma, addr);
}
-static int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long addr, pte_t pte, pte_t *ptep, pmd_t *pmd)
+static int do_numa_page(struct fault_env *fe, pte_t pte)
{
+ struct vm_area_struct *vma = fe->vma;
struct page *page = NULL;
- spinlock_t *ptl;
int page_nid = -1;
int last_cpupid;
int target_nid;
@@ -3248,10 +3228,10 @@
* page table entry is not accessible, so there would be no
* concurrent hardware modifications to the PTE.
*/
- ptl = pte_lockptr(mm, pmd);
- spin_lock(ptl);
- if (unlikely(!pte_same(*ptep, pte))) {
- pte_unmap_unlock(ptep, ptl);
+ fe->ptl = pte_lockptr(vma->vm_mm, fe->pmd);
+ spin_lock(fe->ptl);
+ if (unlikely(!pte_same(*fe->pte, pte))) {
+ pte_unmap_unlock(fe->pte, fe->ptl);
goto out;
}
@@ -3260,18 +3240,18 @@
pte = pte_mkyoung(pte);
if (was_writable)
pte = pte_mkwrite(pte);
- set_pte_at(mm, addr, ptep, pte);
- update_mmu_cache(vma, addr, ptep);
+ set_pte_at(vma->vm_mm, fe->address, fe->pte, pte);
+ update_mmu_cache(vma, fe->address, fe->pte);
- page = vm_normal_page(vma, addr, pte);
+ page = vm_normal_page(vma, fe->address, pte);
if (!page) {
- pte_unmap_unlock(ptep, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
return 0;
}
/* TODO: handle PTE-mapped THP */
if (PageCompound(page)) {
- pte_unmap_unlock(ptep, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
return 0;
}
@@ -3295,8 +3275,9 @@
last_cpupid = page_cpupid_last(page);
page_nid = page_to_nid(page);
- target_nid = numa_migrate_prep(page, vma, addr, page_nid, &flags);
- pte_unmap_unlock(ptep, ptl);
+ target_nid = numa_migrate_prep(page, vma, fe->address, page_nid,
+ &flags);
+ pte_unmap_unlock(fe->pte, fe->ptl);
if (target_nid == -1) {
put_page(page);
goto out;
@@ -3316,24 +3297,24 @@
return 0;
}
-static int create_huge_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd, unsigned int flags)
+static int create_huge_pmd(struct fault_env *fe)
{
+ struct vm_area_struct *vma = fe->vma;
if (vma_is_anonymous(vma))
- return do_huge_pmd_anonymous_page(mm, vma, address, pmd, flags);
+ return do_huge_pmd_anonymous_page(fe);
if (vma->vm_ops->pmd_fault)
- return vma->vm_ops->pmd_fault(vma, address, pmd, flags);
+ return vma->vm_ops->pmd_fault(vma, fe->address, fe->pmd,
+ fe->flags);
return VM_FAULT_FALLBACK;
}
-static int wp_huge_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd, pmd_t orig_pmd,
- unsigned int flags)
+static int wp_huge_pmd(struct fault_env *fe, pmd_t orig_pmd)
{
- if (vma_is_anonymous(vma))
- return do_huge_pmd_wp_page(mm, vma, address, pmd, orig_pmd);
- if (vma->vm_ops->pmd_fault)
- return vma->vm_ops->pmd_fault(vma, address, pmd, flags);
+ if (vma_is_anonymous(fe->vma))
+ return do_huge_pmd_wp_page(fe, orig_pmd);
+ if (fe->vma->vm_ops->pmd_fault)
+ return fe->vma->vm_ops->pmd_fault(fe->vma, fe->address, fe->pmd,
+ fe->flags);
return VM_FAULT_FALLBACK;
}
@@ -3353,12 +3334,9 @@
* The mmap_sem may have been released depending on flags and our
* return value. See filemap_fault() and __lock_page_or_retry().
*/
-static int handle_pte_fault(struct mm_struct *mm,
- struct vm_area_struct *vma, unsigned long address,
- pte_t *pte, pmd_t *pmd, unsigned int flags)
+static int handle_pte_fault(struct fault_env *fe)
{
pte_t entry;
- spinlock_t *ptl;
/*
* some architectures can have larger ptes than wordsize,
@@ -3368,37 +3346,34 @@
* we later double check anyway with the ptl lock held. So here
* a barrier will do.
*/
- entry = *pte;
+ entry = *fe->pte;
barrier();
if (!pte_present(entry)) {
if (pte_none(entry)) {
- if (vma_is_anonymous(vma))
- return do_anonymous_page(mm, vma, address,
- pte, pmd, flags);
+ if (vma_is_anonymous(fe->vma))
+ return do_anonymous_page(fe);
else
- return do_fault(mm, vma, address, pte, pmd,
- flags, entry);
+ return do_fault(fe, entry);
}
- return do_swap_page(mm, vma, address,
- pte, pmd, flags, entry);
+ return do_swap_page(fe, entry);
}
if (pte_protnone(entry))
- return do_numa_page(mm, vma, address, entry, pte, pmd);
+ return do_numa_page(fe, entry);
- ptl = pte_lockptr(mm, pmd);
- spin_lock(ptl);
- if (unlikely(!pte_same(*pte, entry)))
+ fe->ptl = pte_lockptr(fe->vma->vm_mm, fe->pmd);
+ spin_lock(fe->ptl);
+ if (unlikely(!pte_same(*fe->pte, entry)))
goto unlock;
- if (flags & FAULT_FLAG_WRITE) {
+ if (fe->flags & FAULT_FLAG_WRITE) {
if (!pte_write(entry))
- return do_wp_page(mm, vma, address,
- pte, pmd, ptl, entry);
+ return do_wp_page(fe, entry);
entry = pte_mkdirty(entry);
}
entry = pte_mkyoung(entry);
- if (ptep_set_access_flags(vma, address, pte, entry, flags & FAULT_FLAG_WRITE)) {
- update_mmu_cache(vma, address, pte);
+ if (ptep_set_access_flags(fe->vma, fe->address, fe->pte, entry,
+ fe->flags & FAULT_FLAG_WRITE)) {
+ update_mmu_cache(fe->vma, fe->address, fe->pte);
} else {
/*
* This is needed only for protection faults but the arch code
@@ -3406,11 +3381,11 @@
* This still avoids useless tlb flushes for .text page faults
* with threads.
*/
- if (flags & FAULT_FLAG_WRITE)
- flush_tlb_fix_spurious_fault(vma, address);
+ if (fe->flags & FAULT_FLAG_WRITE)
+ flush_tlb_fix_spurious_fault(fe->vma, fe->address);
}
unlock:
- pte_unmap_unlock(pte, ptl);
+ pte_unmap_unlock(fe->pte, fe->ptl);
return 0;
}
@@ -3423,51 +3398,42 @@
static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
unsigned int flags)
{
+ struct fault_env fe = {
+ .vma = vma,
+ .address = address,
+ .flags = flags,
+ };
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgd;
pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
-
- if (!arch_vma_access_permitted(vma, flags & FAULT_FLAG_WRITE,
- flags & FAULT_FLAG_INSTRUCTION,
- flags & FAULT_FLAG_REMOTE))
- return VM_FAULT_SIGSEGV;
-
- if (unlikely(is_vm_hugetlb_page(vma)))
- return hugetlb_fault(mm, vma, address, flags);
pgd = pgd_offset(mm, address);
pud = pud_alloc(mm, pgd, address);
if (!pud)
return VM_FAULT_OOM;
- pmd = pmd_alloc(mm, pud, address);
- if (!pmd)
+ fe.pmd = pmd_alloc(mm, pud, address);
+ if (!fe.pmd)
return VM_FAULT_OOM;
- if (pmd_none(*pmd) && transparent_hugepage_enabled(vma)) {
- int ret = create_huge_pmd(mm, vma, address, pmd, flags);
+ if (pmd_none(*fe.pmd) && transparent_hugepage_enabled(vma)) {
+ int ret = create_huge_pmd(&fe);
if (!(ret & VM_FAULT_FALLBACK))
return ret;
} else {
- pmd_t orig_pmd = *pmd;
+ pmd_t orig_pmd = *fe.pmd;
int ret;
barrier();
if (pmd_trans_huge(orig_pmd) || pmd_devmap(orig_pmd)) {
- unsigned int dirty = flags & FAULT_FLAG_WRITE;
-
if (pmd_protnone(orig_pmd))
- return do_huge_pmd_numa_page(mm, vma, address,
- orig_pmd, pmd);
+ return do_huge_pmd_numa_page(&fe, orig_pmd);
- if (dirty && !pmd_write(orig_pmd)) {
- ret = wp_huge_pmd(mm, vma, address, pmd,
- orig_pmd, flags);
+ if ((fe.flags & FAULT_FLAG_WRITE) &&
+ !pmd_write(orig_pmd)) {
+ ret = wp_huge_pmd(&fe, orig_pmd);
if (!(ret & VM_FAULT_FALLBACK))
return ret;
} else {
- huge_pmd_set_accessed(mm, vma, address, pmd,
- orig_pmd, dirty);
+ huge_pmd_set_accessed(&fe, orig_pmd);
return 0;
}
}
@@ -3478,7 +3444,7 @@
* run pte_offset_map on the pmd, if an huge pmd could
* materialize from under us from a different thread.
*/
- if (unlikely(pte_alloc(mm, pmd, address)))
+ if (unlikely(pte_alloc(fe.vma->vm_mm, fe.pmd, fe.address)))
return VM_FAULT_OOM;
/*
* If a huge pmd materialized under us just retry later. Use
@@ -3491,7 +3457,7 @@
* through an atomic read in C, which is what pmd_trans_unstable()
* provides.
*/
- if (unlikely(pmd_trans_unstable(pmd) || pmd_devmap(*pmd)))
+ if (unlikely(pmd_trans_unstable(fe.pmd) || pmd_devmap(*fe.pmd)))
return 0;
/*
* A regular pmd is established and it can't morph into a huge pmd
@@ -3499,9 +3465,9 @@
* read mode and khugepaged takes it in write mode. So now it's
* safe to run pte_offset_map().
*/
- pte = pte_offset_map(pmd, address);
+ fe.pte = pte_offset_map(fe.pmd, fe.address);
- return handle_pte_fault(mm, vma, address, pte, pmd, flags);
+ return handle_pte_fault(&fe);
}
/*
@@ -3530,7 +3496,15 @@
if (flags & FAULT_FLAG_USER)
mem_cgroup_oom_enable();
- ret = __handle_mm_fault(vma, address, flags);
+ if (!arch_vma_access_permitted(vma, flags & FAULT_FLAG_WRITE,
+ flags & FAULT_FLAG_INSTRUCTION,
+ flags & FAULT_FLAG_REMOTE))
+ return VM_FAULT_SIGSEGV;
+
+ if (unlikely(is_vm_hugetlb_page(vma)))
+ ret = hugetlb_fault(vma->vm_mm, vma, address, flags);
+ else
+ ret = __handle_mm_fault(vma, address, flags);
if (flags & FAULT_FLAG_USER) {
mem_cgroup_oom_disable();
diff --git a/mm/nommu.c b/mm/nommu.c
index c2e588802..95daf81 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1809,7 +1809,8 @@
}
EXPORT_SYMBOL(filemap_fault);
-void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf)
+void filemap_map_pages(struct fault_env *fe,
+ pgoff_t start_pgoff, pgoff_t end_pgoff)
{
BUG();
}
