linux-kernel - [PATCHv2, RFC 11/30] thp, mm: handle tail pages in page_cache_get

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Message-Id: <1363283435-7666-12-git-send-email-kirill.shutemov@linux.intel.com>
Date:	Thu, 14 Mar 2013 19:50:16 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>
Cc:	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv2, RFC 11/30] thp, mm: handle tail pages in page_cache_get_speculative()

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

For tail page we call __get_page_tail(). It has the same semantics, but
for tail page.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 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 3521b0d..408c4e3 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -159,6 +159,9 @@ static inline int page_cache_get_speculative(struct page *page)
 {
 	VM_BUG_ON(in_interrupt());
 
+	if (unlikely(PageTail(page)))
+		return __get_page_tail(page);
+
 #ifdef CONFIG_TINY_RCU
 # ifdef CONFIG_PREEMPT_COUNT
 	VM_BUG_ON(!in_atomic());
@@ -185,7 +188,6 @@ 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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