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Date: Tue, 9 Nov 2010 12:21:58 -0800 From: Greg Thelen <gthelen@...gle.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Balbir Singh <balbir@...ux.vnet.ibm.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Daisuke Nishimura <nishimura@....nes.nec.co.jp>, Johannes Weiner <hannes@...xchg.org>, Wu Fengguang <fengguang.wu@...el.com>, Minchan Kim <minchan.kim@...il.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Greg Thelen <gthelen@...gle.com> Subject: [PATCH] memcg: mark mem_cgroup_page_stat() underflow unlikely Add unlikely() to indicate that underflow of per-cpu counter sum is not expected. The underflow is already handled, but should have been marked unlikely. Reported-by: Wu Fengguang <fengguang.wu@...el.com> Signed-off-by: Greg Thelen <gthelen@...gle.com> --- mm/memcontrol.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index ed070d0..e8fbade 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1393,7 +1393,7 @@ unsigned long mem_cgroup_page_stat(struct mem_cgroup *mem, * value. This function returns an unsigned value, so round it up to * zero to avoid returning a very large value. */ - if (value < 0) + if (unlikely(value < 0)) value = 0; put_online_cpus(); -- 1.7.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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