aleph/lkl_linux
1
0
Fork 0
mirror of https://github.com/lkl/linux.git synced 2025-12-19 08:03:01 +09:00
Code Issues Packages Projects Releases Wiki Activity

secretmem: convert page_is_secretmem() to folio_is_secretmem()

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

15
include/linux/secretmem.h
View File

@@ -6,24 +6,23 @@
extern const struct address_space_operations secretmem_aops; 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; struct address_space *mapping;
/* /*
* Using page_mapping() is quite slow because of the actual call * Using folio_mapping() is quite slow because of the actual call
* instruction and repeated compound_head(page) inside the * instruction.
* page_mapping() function.
* We know that secretmem pages are not compound and LRU so we can * We know that secretmem pages are not compound and LRU so we can
* save a couple of cycles here. * save a couple of cycles here.
*/ */
if (PageCompound(page) || !PageLRU(page)) if (folio_test_large(folio) || !folio_test_lru(folio))
return false; return false;
mapping = (struct address_space *) 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 false;
return mapping->a_ops == &secretmem_aops; return mapping->a_ops == &secretmem_aops;
@@ -39,7 +38,7 @@ static inline bool vma_is_secretmem(struct vm_area_struct *vma)
return false; return false;
} }
static inline bool page_is_secretmem(struct page *page) static inline bool folio_is_secretmem(struct folio *folio)
{ {
return false; 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) if (!folio)
goto pte_unmap; goto pte_unmap;
if (unlikely(page_is_secretmem(page))) { if (unlikely(folio_is_secretmem(folio))) {
gup_put_folio(folio, 1, flags); gup_put_folio(folio, 1, flags);
goto pte_unmap; goto pte_unmap;
} }