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userfault; expand folio use in mfill_atomic_install_pte()

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Call page_folio() a little earlier so we can use folio_mapping()
instead of page_mapping(), saving a call to compound_head().

Link: https://lkml.kernel.org/r/20240423225552.4113447-6-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-04-23 23:55:36 +01:00 committed by Andrew Morton
parent e18a9faf06
commit a568b4126b
1 changed files with 2 additions and 3 deletions
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5
mm/userfaultfd.c
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@ -180,9 +180,9 @@ int mfill_atomic_install_pte(pmd_t *dst_pmd,
pte_t _dst_pte, *dst_pte;
bool writable = dst_vma->vm_flags & VM_WRITE;
bool vm_shared = dst_vma->vm_flags & VM_SHARED;
bool page_in_cache = page_mapping(page);
spinlock_t *ptl;
struct folio *folio;
struct folio *folio = page_folio(page);
bool page_in_cache = folio_mapping(folio);
_dst_pte = mk_pte(page, dst_vma->vm_page_prot);
_dst_pte = pte_mkdirty(_dst_pte);
@ -212,7 +212,6 @@ int mfill_atomic_install_pte(pmd_t *dst_pmd,
if (!pte_none_mostly(ptep_get(dst_pte)))
goto out_unlock;
folio = page_folio(page);
if (page_in_cache) {
/* Usually, cache pages are already added to LRU */
if (newly_allocated)