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authorMatthew Wilcox (Oracle) <willy@infradead.org>2022-09-02 20:46:45 +0100
committerAndrew Morton <akpm@linux-foundation.org>2022-10-03 14:02:53 -0700
commit595af4c9368aba88c45831ef80ed686b602fe3fe (patch)
treecc5ad9248eda00bdf72ad476b25e1e84e399fa8b /mm/rmap.c
parent3b344157c0c15b8f9588e3021dfb22ee25f4508a (diff)
downloadlwn-595af4c9368aba88c45831ef80ed686b602fe3fe.tar.gz
lwn-595af4c9368aba88c45831ef80ed686b602fe3fe.zip
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>
Diffstat (limited to 'mm/rmap.c')
-rw-r--r--mm/rmap.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index 2ff17b9aabd9..d44ff516a208 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -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;
-
- page = compound_head(page);
+ void *anon_vma = vma->anon_vma;
+ struct folio *folio = page_folio(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);
}
/**