linux-kernel - [RFC PATCH v2 3/9] x86: avoid using on_each

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Date:	Sun,  8 Jan 2012 15:32:23 +0200
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	linux-kernel@...r.kernel.org
Cc:	Gilad Ben-Yossef <gilad@...yossef.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: [RFC PATCH v2 3/9] x86: avoid using on_each_cpu hard coded ret value

on_each_cpu always returns a hard coded return code of zero.

Removing all tests based on this return value saves run time
cycles for compares and code bloat for branches.

Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Reviewed-by: Michal Nazarewicz <mina86@...a86.com>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Ingo Molnar <mingo@...hat.com>
CC: "H. Peter Anvin" <hpa@...or.com>
CC: x86@...nel.org
---
 arch/x86/lib/cache-smp.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/lib/cache-smp.c b/arch/x86/lib/cache-smp.c
index a3c6688..760f7e1 100644
--- a/arch/x86/lib/cache-smp.c
+++ b/arch/x86/lib/cache-smp.c
@@ -14,6 +14,7 @@ EXPORT_SYMBOL(wbinvd_on_cpu);
 
 int wbinvd_on_all_cpus(void)
 {
-	return on_each_cpu(__wbinvd, NULL, 1);
+	on_each_cpu(__wbinvd, NULL, 1);
+	return 0;
 }
 EXPORT_SYMBOL(wbinvd_on_all_cpus);
-- 
1.7.0.4

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