harden MTRR access

Index: linux-2.6.23.1-xeno/arch/i386/kernel/cpu/mtrr/generic.c
===================================================================
@@ -392,14 +392,14 @@ static void generic_set_all(void)
 	unsigned long mask, count;
 	unsigned long flags;
 
-	local_irq_save(flags);
+	local_irq_save_hw(flags);
 	prepare_set();
 
 	/* Actually set the state */
 	mask = set_mtrr_state();
 
 	post_set();
-	local_irq_restore(flags);
+	local_irq_restore_hw(flags);
 
 	/*  Use the atomic bitops to update the global mask  */
 	for (count = 0; count < sizeof mask * 8; ++count) {

@@ -427,7 +427,7 @@ static void generic_set_mtrr(unsigned in
 
 	vr = &mtrr_state.var_ranges[reg];
 
-	local_irq_save(flags);
+	local_irq_save_hw(flags);
 	prepare_set();
 
 	if (size == 0) {

@@ -446,7 +446,7 @@ static void generic_set_mtrr(unsigned in
 	}
 
 	post_set();
-	local_irq_restore(flags);
+	local_irq_restore_hw(flags);
 }
 
 int generic_validate_add_page(unsigned long base, unsigned long size, unsigned int type)

Index: linux-2.6.23.1-xeno/arch/i386/kernel/cpu/mtrr/main.c
===================================================================
@@ -149,7 +149,7 @@ static void ipi_handler(void *info)
 	struct set_mtrr_data *data = info;
 	unsigned long flags;
 
-	local_irq_save(flags);
+	local_irq_save_hw(flags);
 
 	atomic_dec(&data->count);
 	while(!atomic_read(&data->gate))

@@ -167,7 +167,7 @@ static void ipi_handler(void *info)
 		cpu_relax();
 
 	atomic_dec(&data->count);
-	local_irq_restore(flags);
+	local_irq_restore_hw(flags);
 }
 
 #endif

@@ -237,7 +237,7 @@ static void set_mtrr(unsigned int reg, u
 	if (smp_call_function(ipi_handler, &data, 1, 0) != 0)
 		panic("mtrr: timed out waiting for other CPUs\n");
 
-	local_irq_save(flags);
+	local_irq_save_hw(flags);
 
 	while(atomic_read(&data.count))
 		cpu_relax();

@@ -273,7 +273,7 @@ static void set_mtrr(unsigned int reg, u
 	while(atomic_read(&data.count))
 		cpu_relax();
 
-	local_irq_restore(flags);
+	local_irq_restore_hw(flags);
 }
 
 /**

@@ -726,11 +726,11 @@ void mtrr_ap_init(void)
 	 * 2.cpu hotadd time. We let mtrr_add/del_page hold cpuhotplug lock to
 	 * prevent mtrr entry changes
 	 */
-	local_irq_save(flags);
+	local_irq_save_hw(flags);
 
 	mtrr_if->set_all();
 
-	local_irq_restore(flags);
+	local_irq_restore_hw(flags);
 }
 
 /**