mm: move most of core MM initialization to mm/mm_init.c
The bulk of memory management initialization code is spread all over
mm/page_alloc.c and makes navigating through page allocator functionality
difficult.
Move most of the functions marked __init and __meminit to mm/mm_init.c to
make it better localized and allow some more spare room before
mm/page_alloc.c reaches 10k lines.
No functional changes.
Link: https://lkml.kernel.org/r/20230321170513.2401534-4-rppt@kernel.org
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Doug Berger <opendmb@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/mm/internal.h b/mm/internal.h
index 2a7ffd9..22f1410a 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -202,6 +202,8 @@ pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
* in mm/page_alloc.c
*/
+extern char * const zone_names[MAX_NR_ZONES];
+
/*
* Structure for holding the mostly immutable allocation parameters passed
* between functions involved in allocations, including the alloc_pages*
@@ -366,7 +368,29 @@ extern void __putback_isolated_page(struct page *page, unsigned int order,
extern void memblock_free_pages(struct page *page, unsigned long pfn,
unsigned int order);
extern void __free_pages_core(struct page *page, unsigned int order);
+
+static inline void prep_compound_head(struct page *page, unsigned int order)
+{
+ struct folio *folio = (struct folio *)page;
+
+ set_compound_page_dtor(page, COMPOUND_PAGE_DTOR);
+ set_compound_order(page, order);
+ atomic_set(&folio->_entire_mapcount, -1);
+ atomic_set(&folio->_nr_pages_mapped, 0);
+ atomic_set(&folio->_pincount, 0);
+}
+
+static inline void prep_compound_tail(struct page *head, int tail_idx)
+{
+ struct page *p = head + tail_idx;
+
+ p->mapping = TAIL_MAPPING;
+ set_compound_head(p, head);
+ set_page_private(p, 0);
+}
+
extern void prep_compound_page(struct page *page, unsigned int order);
+
extern void post_alloc_hook(struct page *page, unsigned int order,
gfp_t gfp_flags);
extern int user_min_free_kbytes;
@@ -377,6 +401,7 @@ extern void free_unref_page_list(struct list_head *list);
extern void zone_pcp_reset(struct zone *zone);
extern void zone_pcp_disable(struct zone *zone);
extern void zone_pcp_enable(struct zone *zone);
+extern void zone_pcp_init(struct zone *zone);
extern void *memmap_alloc(phys_addr_t size, phys_addr_t align,
phys_addr_t min_addr,
@@ -474,7 +499,12 @@ isolate_migratepages_range(struct compact_control *cc,
int __alloc_contig_migrate_range(struct compact_control *cc,
unsigned long start, unsigned long end);
-#endif
+
+/* Free whole pageblock and set its migration type to MIGRATE_CMA. */
+void init_cma_reserved_pageblock(struct page *page);
+
+#endif /* CONFIG_COMPACTION || CONFIG_CMA */
+
int find_suitable_fallback(struct free_area *area, unsigned int order,
int migratetype, bool only_stealable, bool *can_steal);
@@ -658,6 +688,12 @@ static inline void vunmap_range_noflush(unsigned long start, unsigned long end)
#endif /* !CONFIG_MMU */
/* Memory initialisation debug and verification */
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+DECLARE_STATIC_KEY_TRUE(deferred_pages);
+
+bool __init deferred_grow_zone(struct zone *zone, unsigned int order);
+#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
+
enum mminit_level {
MMINIT_WARNING,
MMINIT_VERIFY,
