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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-09-02 20:46:45 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 14:02:53 -0700 |
| commit | 595af4c9368aba88c45831ef80ed686b602fe3fe (patch) | |
| tree | cc5ad9248eda00bdf72ad476b25e1e84e399fa8b /mm/rmap.c | |
| parent | 3b344157c0c15b8f9588e3021dfb22ee25f4508a (diff) | |
| download | lwn-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.c | 14 |
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); } /** |