linux-kernel - [RFC PATCH 4/9] alpha: avoid using on_each

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Date:	Tue,  3 Jan 2012 16:19:08 +0200
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	linux-kernel@...r.kernel.org
Cc:	Gilad Ben-Yossef <gilad@...yossef.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>, linux-alpha@...r.kernel.org
Subject: [RFC PATCH 4/9] alpha: 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.

CC: Michal Nazarewicz <mina86@...a86.com>
CC: Richard Henderson <rth@...ddle.net>
CC: Ivan Kokshaysky <ink@...assic.park.msu.ru>
CC: Matt Turner <mattst88@...il.com>
CC: linux-alpha@...r.kernel.org
---
 arch/alpha/kernel/smp.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index 4087a56..97707e9 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -659,8 +659,7 @@ void
 smp_imb(void)
 {
 	/* Must wait other processors to flush their icache before continue. */
-	if (on_each_cpu(ipi_imb, NULL, 1))
-		printk(KERN_CRIT "smp_imb: timed out\n");
+	on_each_cpu(ipi_imb, NULL, 1);
 }
 EXPORT_SYMBOL(smp_imb);
 
@@ -675,9 +674,7 @@ flush_tlb_all(void)
 {
 	/* Although we don't have any data to pass, we do want to
 	   synchronize with the other processors.  */
-	if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) {
-		printk(KERN_CRIT "flush_tlb_all: timed out\n");
-	}
+	on_each_cpu(ipi_flush_tlb_all, NULL, 1);
 }
 
 #define asn_locked() (cpu_data[smp_processor_id()].asn_lock)
-- 
1.7.0.4

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