From 81615b624a45621b758380ec45d750483eae281d Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 26 Jun 2006 00:24:32 -0700
Subject: [PATCH] [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>
---
kernel/cpu.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/kernel/cpu.c b/kernel/cpu.c
index fe2b8d0bfe4ce..03dcd981846a6 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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