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authorJan Beulich <jbeulich@novell.com>2008-05-12 15:44:39 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-05-22 19:11:20 +0200
commitb478458aeebfc55fe409abec43794ac72a623c79 (patch)
tree8a007777d874172de964c4e724f968fa0ae8d301 /arch/x86/kernel/ldt.c
parent78b58e549a3098a8c1408d0214bd25e5d5e7a3a3 (diff)
downloadop-kernel-dev-b478458aeebfc55fe409abec43794ac72a623c79.zip
op-kernel-dev-b478458aeebfc55fe409abec43794ac72a623c79.tar.gz
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>
Diffstat (limited to 'arch/x86/kernel/ldt.c')
-rw-r--r--arch/x86/kernel/ldt.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c
index 0224c36..21f2bae 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);
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