linux-kernel - [PATCH 14/22] mm, page_alloc: Simplify last cpupid reset

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Message-Id: <1460362424-26369-15-git-send-email-mgorman@techsingularity.net>
Date:	Mon, 11 Apr 2016 09:13:37 +0100
From:	Mel Gorman <mgorman@...hsingularity.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Vlastimil Babka <vbabka@...e.cz>, Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 14/22] mm, page_alloc: Simplify last cpupid reset

The current reset unnecessarily clears flags and makes pointless calculations.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 include/linux/mm.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ed6407d1b7b5..8f409818401c 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -837,10 +837,7 @@ extern int page_cpupid_xchg_last(struct page *page, int cpupid);
 
 static inline void page_cpupid_reset_last(struct page *page)
 {
-	int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
-
-	page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
-	page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
+	page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT;
 }
 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
 #else /* !CONFIG_NUMA_BALANCING */
-- 
2.6.4