mm: khugepaged: make hugepage_vma_check() non-static
The hugepage_vma_check() could be reused by khugepaged_enter() and
khugepaged_enter_vma_merge(), but it is static in khugepaged.c. Make it
non-static and declare it in khugepaged.h.
Link: https://lkml.kernel.org/r/20220510203222.24246-7-shy828301@gmail.com
Signed-off-by: Yang Shi <shy828301@gmail.com>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Song Liu <song@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index b43b294..9ef626e 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -437,8 +437,8 @@ static inline int khugepaged_test_exit(struct mm_struct *mm)
return atomic_read(&mm->mm_users) == 0;
}
-static bool hugepage_vma_check(struct vm_area_struct *vma,
- unsigned long vm_flags)
+bool hugepage_vma_check(struct vm_area_struct *vma,
+ unsigned long vm_flags)
{
if (!transhuge_vma_enabled(vma, vm_flags))
return false;
@@ -508,20 +508,13 @@ void __khugepaged_enter(struct mm_struct *mm)
void khugepaged_enter_vma_merge(struct vm_area_struct *vma,
unsigned long vm_flags)
{
- unsigned long hstart, hend;
-
- /*
- * khugepaged only supports read-only files for non-shmem files.
- * khugepaged does not yet work on special mappings. And
- * file-private shmem THP is not supported.
- */
- if (!hugepage_vma_check(vma, vm_flags))
- return;
-
- hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
- hend = vma->vm_end & HPAGE_PMD_MASK;
- if (hstart < hend)
- khugepaged_enter(vma, vm_flags);
+ if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags) &&
+ khugepaged_enabled() &&
+ (((vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK) <
+ (vma->vm_end & HPAGE_PMD_MASK))) {
+ if (hugepage_vma_check(vma, vm_flags))
+ __khugepaged_enter(vma->vm_mm);
+ }
}
void __khugepaged_exit(struct mm_struct *mm)
