linux-kernel - [PATCH] mm: percpu: micro-optimize round-to-even

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Message-Id: <1403172149-25353-1-git-send-email-linux@rasmusvillemoes.dk>
Date:	Thu, 19 Jun 2014 12:02:29 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH] mm: percpu: micro-optimize round-to-even

This change shaves a few bytes off the generated code.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 mm/percpu.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index 2ddf9a9..978097f 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -720,8 +720,7 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved)
 	if (unlikely(align < 2))
 		align = 2;
 
-	if (unlikely(size & 1))
-		size++;
+	size += size & 1;
 
 	if (unlikely(!size || size > PCPU_MIN_UNIT_SIZE || align > PAGE_SIZE)) {
 		WARN(true, "illegal size (%zu) or align (%zu) for "
-- 
1.9.2

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