From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Tue, 15 Mar 2011 01:57:37 +0000 (+0800)
Subject: x86, tlb, UV: Do small micro-optimization for native_flush_tlb_others()
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=25542c646afbf14c43fa7d2b443055cadb73b07a;p=deliverable%2Flinux.git

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@cn.fujitsu.com>
Cc: Cliff Wickman <cpw@sgi.com>
LKML-Reference: <4D7EC791.4040003@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 55272d7c3b0b..d6c0418c3e47 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);