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rmap: convert page_move_anon_rmap() to use a folio 

Removes one call to compound_head() and a reference to page->mapping.

Link: https://lkml.kernel.org/r/20220902194653.1739778-50-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-09-02 20:46:45 +01:00 committed by Andrew Morton
parent 3b344157c0
commit 595af4c936
1 changed files with 6 additions and 8 deletions
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14
mm/rmap.c
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@ -1099,22 +1099,20 @@ int pfn_mkclean_range(unsigned long pfn, unsigned long nr_pages, pgoff_t pgoff,
*/
void page_move_anon_rmap(struct page *page, struct vm_area_struct *vma)
{
struct anon_vma *anon_vma = vma->anon_vma;
struct page *subpage = page;
void *anon_vma = vma->anon_vma;
struct folio *folio = page_folio(page);
page = compound_head(page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
VM_BUG_ON_VMA(!anon_vma, vma);
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
anon_vma += PAGE_MAPPING_ANON;
/*
* Ensure that anon_vma and the PAGE_MAPPING_ANON bit are written
* simultaneously, so a concurrent reader (eg folio_referenced()'s
* folio_test_anon()) will not see one without the other.
*/
WRITE_ONCE(page->mapping, (struct address_space *) anon_vma);
SetPageAnonExclusive(subpage);
WRITE_ONCE(folio->mapping, anon_vma);
SetPageAnonExclusive(page);
}
/**