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authorIngo Molnar <mingo@elte.hu>2006-06-26 00:24:32 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:16 -0700
commit81615b624a45621b758380ec45d750483eae281d (patch)
tree9373ca3e4a484fe4fdac48ae6e6d204c7e560121
parent1fb00c6cbd8356f43b46322742f3c01c2a1f02da (diff)
downloadop-kernel-dev-81615b624a45621b758380ec45d750483eae281d.zip
op-kernel-dev-81615b624a45621b758380ec45d750483eae281d.tar.gz
[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>
-rw-r--r--kernel/cpu.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index fe2b8d0..03dcd98 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);
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