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authorMatthew Wilcox (Oracle) <willy@infradead.org>2022-02-01 23:33:08 -0500
committerMatthew Wilcox (Oracle) <willy@infradead.org>2022-03-21 13:01:35 -0400
commit9595d76942b8714627d670a7e7ae543812c731ae (patch)
treefebd0a334505f4e11fcd427b96e740ab0548a3cc /mm/folio-compat.c
parentc8423186078312d344474bcb9e2b1ce0a78dbde4 (diff)
mm/rmap: Turn page_lock_anon_vma_read() into folio_lock_anon_vma_read()
Add back page_lock_anon_vma_read() as a wrapper. This saves a few calls to compound_head(). If any callers were passing a tail page before, this would have failed to lock the anon VMA as page->mapping is not valid for tail pages. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Diffstat (limited to 'mm/folio-compat.c')
-rw-r--r--mm/folio-compat.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/folio-compat.c b/mm/folio-compat.c
index 46fa179e32fb..968ad97bbffa 100644
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -164,3 +164,10 @@ void putback_lru_page(struct page *page)
{
folio_putback_lru(page_folio(page));
}
+
+#ifdef CONFIG_MMU
+struct anon_vma *page_lock_anon_vma_read(struct page *page)
+{
+ return folio_lock_anon_vma_read(page_folio(page));
+}
+#endif