linux-kernel - [PATCH] x86: avoid re-loading LDT in unrelated address spaces

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Message-Id: <480E20C4.76E4.0078.0@novell.com>
Date:	Tue, 22 Apr 2008 16:30:44 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: avoid re-loading LDT in unrelated address spaces

Signed-off-by: Jan Beulich <jbeulich@...ell.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(&current->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);



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