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mm: Turn can_split_huge_page() into can_split_folio() 

This function already required a head page to be passed, so this
just adds type-safety and removes a few implicit calls to
compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-02-04 14:13:31 -05:00
parent e0cd5e7ffa
commit d4b4084ac3
3 changed files with 13 additions and 12 deletions
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4
include/linux/huge_mm.h
View File

@ -185,7 +185,7 @@ void prep_transhuge_page(struct page *page);
void free_transhuge_page(struct page *page);
bool is_transparent_hugepage(struct page *page);
bool can_split_huge_page(struct page *page, int *pextra_pins);
bool can_split_folio(struct folio *folio, int *pextra_pins);
int split_huge_page_to_list(struct page *page, struct list_head *list);
static inline int split_huge_page(struct page *page)
{
@ -387,7 +387,7 @@ static inline bool is_transparent_hugepage(struct page *page)
#define thp_get_unmapped_area NULL
static inline bool
can_split_huge_page(struct page *page, int *pextra_pins)
can_split_folio(struct folio *folio, int *pextra_pins)
{
BUILD_BUG();
return false;

15
mm/huge_memory.c
View File

@ -2516,18 +2516,19 @@ int page_trans_huge_mapcount(struct page *page)
}
/* Racy check whether the huge page can be split */
bool can_split_huge_page(struct page *page, int *pextra_pins)
bool can_split_folio(struct folio *folio, int *pextra_pins)
{
int extra_pins;
/* Additional pins from page cache */
if (PageAnon(page))
extra_pins = PageSwapCache(page) ? thp_nr_pages(page) : 0;
if (folio_test_anon(folio))
extra_pins = folio_test_swapcache(folio) ?
folio_nr_pages(folio) : 0;
else
extra_pins = thp_nr_pages(page);
extra_pins = folio_nr_pages(folio);
if (pextra_pins)
*pextra_pins = extra_pins;
return total_mapcount(page) == page_count(page) - extra_pins - 1;
return folio_mapcount(folio) == folio_ref_count(folio) - extra_pins - 1;
}
/*
@ -2619,7 +2620,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
* Racy check if we can split the page, before unmap_page() will
* split PMDs
*/
if (!can_split_huge_page(head, &extra_pins)) {
if (!can_split_folio(folio, &extra_pins)) {
ret = -EBUSY;
goto out_unlock;
}
@ -2928,7 +2929,7 @@ static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
goto next;
total++;
if (!can_split_huge_page(compound_head(page), NULL))
if (!can_split_folio(page_folio(page), NULL))
goto next;
if (!trylock_page(page))

6
mm/vmscan.c
View File

@ -1703,18 +1703,18 @@ static unsigned int shrink_page_list(struct list_head *page_list,
if (!PageSwapCache(page)) {
if (!(sc->gfp_mask & __GFP_IO))
goto keep_locked;
if (page_maybe_dma_pinned(page))
if (folio_maybe_dma_pinned(folio))
goto keep_locked;
if (PageTransHuge(page)) {
/* cannot split THP, skip it */
if (!can_split_huge_page(page, NULL))
if (!can_split_folio(folio, NULL))
goto activate_locked;
/*
* Split pages without a PMD map right
* away. Chances are some or all of the
* tail pages can be freed without IO.
*/
if (!compound_mapcount(page) &&
if (!folio_entire_mapcount(folio) &&
split_folio_to_list(folio,
page_list))
goto activate_locked;