x86/mce: Convert static array of pointers to per-cpu variables

When I previously fixed up the mce_device code, I used a static array of
the pointers.  It was (rightfully) pointed out to me that I should be
using the per_cpu code instead.

This patch converts the code over to that structure, moving the variable
back into the per_cpu area, like it used to be for 3.2 and earlier.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Link: https://lkml.org/lkml/2012/1/27/165
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/x86/include/asm/mce.h

@@ -151,7 +151,7 @@ static inline void enable_p5_mce(void) {}
 
 void mce_setup(struct mce *m);
 void mce_log(struct mce *m);
-extern struct device *mce_device[CONFIG_NR_CPUS];
+DECLARE_PER_CPU(struct device *, mce_device);
 
 /*
  * Maximum banks number.

arch/x86/kernel/cpu/mcheck/mce.c

@@ -1859,7 +1859,7 @@ static struct bus_type mce_subsys = {
 	.dev_name	= "machinecheck",
 };
 
-struct device *mce_device[CONFIG_NR_CPUS];
+DEFINE_PER_CPU(struct device *, mce_device);
 
 __cpuinitdata
 void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu);
@@ -2038,7 +2038,7 @@ static __cpuinit int mce_device_create(unsigned int cpu)
 			goto error2;
 	}
 	cpumask_set_cpu(cpu, mce_device_initialized);
-	mce_device[cpu] = dev;
+	per_cpu(mce_device, cpu) = dev;
 
 	return 0;
 error2:
@@ -2055,7 +2055,7 @@ error:
 
 static __cpuinit void mce_device_remove(unsigned int cpu)
 {
-	struct device *dev = mce_device[cpu];
+	struct device *dev = per_cpu(mce_device, cpu);
 	int i;
 
 	if (!cpumask_test_cpu(cpu, mce_device_initialized))
@@ -2069,7 +2069,7 @@ static __cpuinit void mce_device_remove(unsigned int cpu)
 
 	device_unregister(dev);
 	cpumask_clear_cpu(cpu, mce_device_initialized);
-	mce_device[cpu] = NULL;
+	per_cpu(mce_device, cpu) = NULL;
 }
 
 /* Make sure there are no machine checks on offlined CPUs. */

arch/x86/kernel/cpu/mcheck/mce_amd.c

@@ -523,7 +523,7 @@ static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
 {
 	int i, err = 0;
 	struct threshold_bank *b = NULL;
-	struct device *dev = mce_device[cpu];
+	struct device *dev = per_cpu(mce_device, cpu);
 	char name[32];
 
 	sprintf(name, "threshold_bank%i", bank);
@@ -585,7 +585,7 @@ static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
 		if (i == cpu)
 			continue;
 
-		dev = mce_device[i];
+		dev = per_cpu(mce_device, i);
 		if (dev)
 			err = sysfs_create_link(&dev->kobj,b->kobj, name);
 		if (err)
@@ -665,7 +665,8 @@ static void threshold_remove_bank(unsigned int cpu, int bank)
 #ifdef CONFIG_SMP
 	/* sibling symlink */
 	if (shared_bank[bank] && b->blocks->cpu != cpu) {
-		sysfs_remove_link(&mce_device[cpu]->kobj, name);
+		dev = per_cpu(mce_device, cpu);
+		sysfs_remove_link(&dev->kobj, name);
 		per_cpu(threshold_banks, cpu)[bank] = NULL;
 
 		return;
@@ -677,7 +678,7 @@ static void threshold_remove_bank(unsigned int cpu, int bank)
 		if (i == cpu)
 			continue;
 
-		dev = mce_device[i];
+		dev = per_cpu(mce_device, i);
 		if (dev)
 			sysfs_remove_link(&dev->kobj, name);
 		per_cpu(threshold_banks, i)[bank] = NULL;