linux-kernel - [tip:x86/mm] x86, tlb, UV: Do small micro-optimization for native_flush_tlb

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Message-ID: <tip-25542c646afbf14c43fa7d2b443055cadb73b07a@git.kernel.org>
Date:	Tue, 15 Mar 2011 07:49:08 GMT
From:	tip-bot for Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	cpw@....com, xiaoguangrong@...fujitsu.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:x86/mm] x86, tlb, UV: Do small micro-optimization for native_flush_tlb_others()

Commit-ID:  25542c646afbf14c43fa7d2b443055cadb73b07a
Gitweb:     http://git.kernel.org/tip/25542c646afbf14c43fa7d2b443055cadb73b07a
Author:     Xiao Guangrong <xiaoguangrong@...fujitsu.com>
AuthorDate: Tue, 15 Mar 2011 09:57:37 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 15 Mar 2011 08:30:34 +0100

x86, tlb, UV: Do small micro-optimization for native_flush_tlb_others()

native_flush_tlb_others() is called from:

 flush_tlb_current_task()
 flush_tlb_mm()
 flush_tlb_page()

All these functions disable preemption explicitly, so we can use
smp_processor_id() instead of get_cpu() and put_cpu().

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc: Cliff Wickman <cpw@....com>
LKML-Reference: <4D7EC791.4040003@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/mm/tlb.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 55272d7..d6c0418 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -208,11 +208,10 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
 	if (is_uv_system()) {
 		unsigned int cpu;
 
-		cpu = get_cpu();
+		cpu = smp_processor_id();
 		cpumask = uv_flush_tlb_others(cpumask, mm, va, cpu);
 		if (cpumask)
 			flush_tlb_others_ipi(cpumask, mm, va);
-		put_cpu();
 		return;
 	}
 	flush_tlb_others_ipi(cpumask, mm, va);
--
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