linux-kernel - [PATCH] arch: sparc: kernel: smp

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Date:	Sun,  1 Jun 2014 23:48:18 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	"David S. Miller" <davem@...emloft.net>,
	Kirill Tkhai <tkhai@...dex.ru>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] arch: sparc: kernel: smp_64.c:  Optimization of the Code

>From what I know, AND is faster then modulo.
Not sure if this is worth changing though.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 arch/sparc/kernel/smp_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index 745a363..921d924 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -179,7 +179,7 @@ static inline long get_delta (long *rt, long *master)
 
 	/* average best_t0 and best_t1 without overflow: */
 	tcenter = (best_t0/2 + best_t1/2);
-	if (best_t0 % 2 + best_t1 % 2 == 2)
+	if ((best_t0 & 1) + (best_t1 & 1) == 2)
 		tcenter++;
 	return tcenter - best_tm;
 }
-- 
1.7.10.4

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