[PATCH, RFC 09/16] thp, mm: handle tail pages in page_cache_get_speculative()
From: Kirill A. Shutemov <hidden>
Date: 2013-01-28 09:24:21
Also in:
linux-fsdevel, lkml
Subsystem:
page cache, the rest · Maintainers:
Matthew Wilcox, Jan Kara, Linus Torvalds
From: "Kirill A. Shutemov" <redacted> For tail page we call __get_page_tail(). It has the same semantics, but for tail page. Signed-off-by: Kirill A. Shutemov <redacted> --- include/linux/pagemap.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 0e38e13..1da2043 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h@@ -149,6 +149,9 @@ static inline int page_cache_get_speculative(struct page *page) { VM_BUG_ON(in_interrupt()); + if (unlikely(PageTail(page))) + return __get_page_tail(page); + #if !defined(CONFIG_SMP) && defined(CONFIG_TREE_RCU) # ifdef CONFIG_PREEMPT_COUNT VM_BUG_ON(!in_atomic());
@@ -175,7 +178,6 @@ static inline int page_cache_get_speculative(struct page *page) return 0; } #endif - VM_BUG_ON(PageTail(page)); return 1; }
--
1.7.10.4
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