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mm: remove free_compound_page() and the compound_page_dtors array

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The only remaining destructor is free_compound_page().  Inline it into
destroy_large_folio() and remove the array it used to live in.

Link: https://lkml.kernel.org/r/20230816151201.3655946-7-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-08-16 16:11:54 +01:00 committed by Andrew Morton
parent da6e7bf3a0
commit 0f2f43fabb
2 changed files with 5 additions and 29 deletions
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10
include/linux/mm.h
View File

@ -1239,14 +1239,6 @@ void folio_copy(struct folio *dst, struct folio *src);
unsigned long nr_free_buffer_pages(void);
/*
* Compound pages have a destructor function. Provide a
* prototype for that function and accessor functions.
* These are _only_ valid on the head of a compound page.
*/
typedef void compound_page_dtor(struct page *);
/* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
enum compound_dtor_id {
NULL_COMPOUND_DTOR,
COMPOUND_PAGE_DTOR,
@ -1299,8 +1291,6 @@ static inline unsigned long thp_size(struct page *page)
return PAGE_SIZE << thp_order(page);
}
void free_compound_page(struct page *page);
#ifdef CONFIG_MMU
/*
* Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when

24
mm/page_alloc.c
View File

@ -284,11 +284,6 @@ const char * const migratetype_names[MIGRATE_TYPES] = {
#endif
};
static compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS] = {
[NULL_COMPOUND_DTOR] = NULL,
[COMPOUND_PAGE_DTOR] = free_compound_page,
};
int min_free_kbytes = 1024;
int user_min_free_kbytes = -1;
static int watermark_boost_factor __read_mostly = 15000;
@ -577,19 +572,13 @@ static inline void free_the_page(struct page *page, unsigned int order)
* The remaining PAGE_SIZE pages are called "tail pages". PageTail() is encoded
* in bit 0 of page->compound_head. The rest of bits is pointer to head page.
*
* The first tail page's ->compound_dtor holds the offset in array of compound
* page destructors. See compound_page_dtors.
* The first tail page's ->compound_dtor describes how to destroy the
* compound page.
*
* The first tail page's ->compound_order holds the order of allocation.
* This usage means that zero-order pages may not be compound.
*/
void free_compound_page(struct page *page)
{
mem_cgroup_uncharge(page_folio(page));
free_the_page(page, compound_order(page));
}
void prep_compound_page(struct page *page, unsigned int order)
{
int i;
@ -611,14 +600,11 @@ void destroy_large_folio(struct folio *folio)
return;
}
if (folio_test_transhuge(folio) && dtor == TRANSHUGE_PAGE_DTOR) {
if (folio_test_transhuge(folio) && dtor == TRANSHUGE_PAGE_DTOR)
folio_undo_large_rmappable(folio);
free_compound_page(&folio->page);
return;
}
VM_BUG_ON_FOLIO(dtor >= NR_COMPOUND_DTORS, folio);
compound_page_dtors[dtor](&folio->page);
mem_cgroup_uncharge(folio);
free_the_page(&folio->page, folio_order(folio));
}
static inline void set_buddy_order(struct page *page, unsigned int order)