linux-kernel - [PATCH 19/39] mm: add unlikely to the mm allocation failure check

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Message-Id: <1332783986-24195-20-git-send-email-aarcange@redhat.com>
Date:	Mon, 26 Mar 2012 19:46:06 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH 19/39] mm: add unlikely to the mm allocation failure check

Very minor optimization to hint gcc.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 kernel/fork.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index aefe24f..31b2f35 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -547,7 +547,7 @@ struct mm_struct *mm_alloc(void)
 	struct mm_struct *mm;
 
 	mm = allocate_mm();
-	if (!mm)
+	if (unlikely(!mm))
 		return NULL;
 
 	memset(mm, 0, sizeof(*mm));
--
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