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mm: add is_huge_zero_folio()

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This is the folio equivalent of is_huge_zero_page().  It doesn't add any
efficiency, but it does prevent the caller from passing a tail page and
getting confused when the predicate returns false.

Link: https://lkml.kernel.org/r/20240326202833.523759-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-03-26 20:28:22 +00:00 committed by Andrew Morton
parent 4d30eac374
commit 5beaee54a3
7 changed files with 18 additions and 8 deletions
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2
fs/proc/page.c
View File

@ -155,7 +155,7 @@ u64 stable_page_flags(const struct page *page)
else if (folio_test_large(folio)) {
if ((k & (1 << PG_lru)) || is_anon)
u |= 1 << KPF_THP;
else if (is_huge_zero_page(&folio->page)) {
else if (is_huge_zero_folio(folio)) {
u |= 1 << KPF_ZERO_PAGE;
u |= 1 << KPF_THP;
}

10
include/linux/huge_mm.h
View File

@ -356,6 +356,11 @@ static inline bool is_huge_zero_page(const struct page *page)
return READ_ONCE(huge_zero_page) == page;
}
static inline bool is_huge_zero_folio(const struct folio *folio)
{
return READ_ONCE(huge_zero_page) == &folio->page;
}
static inline bool is_huge_zero_pmd(pmd_t pmd)
{
return pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd);
@ -485,6 +490,11 @@ static inline bool is_huge_zero_page(const struct page *page)
return false;
}
static inline bool is_huge_zero_folio(const struct folio *folio)
{
return false;
}
static inline bool is_huge_zero_pmd(pmd_t pmd)
{
return false;

6
mm/huge_memory.c
View File

@ -789,12 +789,12 @@ struct deferred_split *get_deferred_split_queue(struct folio *folio)
}
#endif
static inline bool is_transparent_hugepage(struct folio *folio)
static inline bool is_transparent_hugepage(const struct folio *folio)
{
if (!folio_test_large(folio))
return false;
return is_huge_zero_page(&folio->page) ||
return is_huge_zero_folio(folio) ||
folio_test_large_rmappable(folio);
}
@ -3085,7 +3085,7 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
}
is_hzp = is_huge_zero_page(&folio->page);
is_hzp = is_huge_zero_folio(folio);
if (is_hzp) {
pr_warn_ratelimited("Called split_huge_page for huge zero page\n");
return -EBUSY;

2
mm/mempolicy.c
View File

@ -510,7 +510,7 @@ static void queue_folios_pmd(pmd_t *pmd, struct mm_walk *walk)
return;
}
folio = pfn_folio(pmd_pfn(*pmd));
if (is_huge_zero_page(&folio->page)) {
if (is_huge_zero_folio(folio)) {
walk->action = ACTION_CONTINUE;
return;
}

2
mm/swap.c
View File

@ -985,7 +985,7 @@ void folios_put_refs(struct folio_batch *folios, unsigned int *refs)
struct folio *folio = folios->folios[i];
unsigned int nr_refs = refs ? refs[i] : 1;
if (is_huge_zero_page(&folio->page))
if (is_huge_zero_folio(folio))
continue;
if (folio_is_zone_device(folio)) {

2
mm/swap_state.c
View File

@ -301,7 +301,7 @@ void free_page_and_swap_cache(struct page *page)
struct folio *folio = page_folio(page);
free_swap_cache(folio);
if (!is_huge_zero_page(page))
if (!is_huge_zero_folio(folio))
folio_put(folio);
}

2
mm/userfaultfd.c
View File

@ -1664,7 +1664,7 @@ ssize_t move_pages(struct userfaultfd_ctx *ctx, unsigned long dst_start,
!pmd_none(dst_pmdval)) {
struct folio *folio = pfn_folio(pmd_pfn(*src_pmd));
if (!folio || (!is_huge_zero_page(&folio->page) &&
if (!folio || (!is_huge_zero_folio(folio) &&
!PageAnonExclusive(&folio->page))) {
spin_unlock(ptl);
err = -EBUSY;