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secretmem: convert page_is_secretmem() to folio_is_secretmem()

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The only caller already has a folio, so use it to save calling
compound_head() in PageLRU() and remove a use of page->mapping.

Link: https://lkml.kernel.org/r/20230822202335.179081-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.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) 2023-08-22 21:23:35 +01:00 committed by Andrew Morton
parent 7db15418d3
commit 8f9ff2deb8
2 changed files with 8 additions and 9 deletions
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15
include/linux/secretmem.h
View file

@ -6,24 +6,23 @@
extern const struct address_space_operations secretmem_aops;
static inline bool page_is_secretmem(struct page *page)
static inline bool folio_is_secretmem(struct folio *folio)
{
struct address_space *mapping;
/*
* Using page_mapping() is quite slow because of the actual call
* instruction and repeated compound_head(page) inside the
* page_mapping() function.
* Using folio_mapping() is quite slow because of the actual call
* instruction.
* We know that secretmem pages are not compound and LRU so we can
* save a couple of cycles here.
*/
if (PageCompound(page) || !PageLRU(page))
if (folio_test_large(folio) || !folio_test_lru(folio))
return false;
mapping = (struct address_space *)
((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
((unsigned long)folio->mapping & ~PAGE_MAPPING_FLAGS);
if (!mapping || mapping != page->mapping)
if (!mapping || mapping != folio->mapping)
return false;
return mapping->a_ops == &secretmem_aops;
@ -39,7 +38,7 @@ static inline bool vma_is_secretmem(struct vm_area_struct *vma)
return false;
}
static inline bool page_is_secretmem(struct page *page)
static inline bool folio_is_secretmem(struct folio *folio)
{
return false;
}

2
mm/gup.c
View file

@ -2600,7 +2600,7 @@ static int gup_pte_range(pmd_t pmd, pmd_t *pmdp, unsigned long addr,
if (!folio)
goto pte_unmap;
if (unlikely(page_is_secretmem(page))) {
if (unlikely(folio_is_secretmem(folio))) {
gup_put_folio(folio, 1, flags);
goto pte_unmap;
}