From: "Jan Beulich" <jbeulich@novell.com>
To: <mingo@elte.hu>, <tglx@linutronix.de>, <hpa@zytor.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: [PATCH] x86: avoid re-loading LDT in unrelated address spaces
Date: Tue, 22 Apr 2008 16:30:44 +0100 [thread overview]
Message-ID: <480E20C4.76E4.0078.0@novell.com> (raw)
Signed-off-by: Jan Beulich <jbeulich@novell.com>
---
arch/x86/kernel/ldt.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- linux-2.6.25/arch/x86/kernel/ldt.c 2008-04-17 04:49:44.000000000 +0200
+++ 2.6.25-x86-filter-load-ldt/arch/x86/kernel/ldt.c 2008-03-04 10:31:12.000000000 +0100
@@ -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(¤t->active_mm->context);
}
#endif
@@ -68,7 +68,7 @@ static int alloc_ldt(mm_context_t *pc, i
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);
reply other threads:[~2008-04-22 15:30 UTC|newest]
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