[PATCH] Convert kernel/cpu.c to mutexes

Convert kernel/cpu.c from semaphore to mutex.

I've reviewed all lock_cpu_hotplug() critical sections, and they all seem to
fit mutex semantics.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/kernel/cpu.c b/kernel/cpu.c
index fe2b8d0bfe4c..03dcd981846a 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -13,10 +13,10 @@
 #include <linux/module.h>
 #include <linux/kthread.h>
 #include <linux/stop_machine.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
 
 /* This protects CPUs going up and down... */
-static DECLARE_MUTEX(cpucontrol);
+static DEFINE_MUTEX(cpucontrol);
 
 static BLOCKING_NOTIFIER_HEAD(cpu_chain);
 
@@ -30,9 +30,9 @@ static int __lock_cpu_hotplug(int interruptible)
 
         if (lock_cpu_hotplug_owner != current) {
                 if (interruptible)
-                        ret = down_interruptible(&cpucontrol);
+                        ret = mutex_lock_interruptible(&cpucontrol);
                 else
-                        down(&cpucontrol);
+                        mutex_lock(&cpucontrol);
         }
 
         /*
@@ -56,7 +56,7 @@ void unlock_cpu_hotplug(void)
 {
         if (--lock_cpu_hotplug_depth == 0) {
                 lock_cpu_hotplug_owner = NULL;
-                up(&cpucontrol);
+                mutex_unlock(&cpucontrol);
         }
 }
 EXPORT_SYMBOL_GPL(unlock_cpu_hotplug);