From: Jan Beulich <jbeulich@novell.com>
Date: Mon, 12 May 2008 13:44:39 +0000 (+0200)
Subject: x86: avoid re-loading LDT in unrelated address spaces
X-Git-Tag: v2.6.27-rc1~1106^2~251^15
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b478458aeebfc55fe409abec43794ac72a623c79;p=linux-2.6

x86: avoid re-loading LDT in unrelated address spaces

Performance optimization.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c
index 0224c3637c..21f2bae98c 100644
--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -20,9 +20,9 @@
 #include <asm/mmu_context.h>
 
 #ifdef CONFIG_SMP
-static void flush_ldt(void *null)
+static void flush_ldt(void *current_mm)
 {
-	if (current->active_mm)
+	if (current->active_mm == current_mm)
 		load_LDT(&current->active_mm->context);
 }
 #endif
@@ -68,7 +68,7 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
 		load_LDT(pc);
 		mask = cpumask_of_cpu(smp_processor_id());
 		if (!cpus_equal(current->mm->cpu_vm_mask, mask))
-			smp_call_function(flush_ldt, NULL, 1, 1);
+			smp_call_function(flush_ldt, current->mm, 1, 1);
 		preempt_enable();
 #else
 		load_LDT(pc);