From: Daniel Walker <dwalker@mvista.com>
Date: Tue, 5 Feb 2008 06:31:27 +0000 (-0800)
Subject: uml: mconsole mutex conversion
X-Git-Tag: v2.6.25-rc1~795
X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=e98fa28160eabdcda4c4c5bf7af7a3256c10c922

uml: mconsole mutex conversion

The plug_mem_mutex is already used as a mutex since it's using
DECLARE_MUTEX(), but the underlying construct is still a semaphore ..  This
patch switches it over to a struct mutex.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 949037e..9820fdb 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -17,6 +17,7 @@
 #include "linux/syscalls.h"
 #include "linux/utsname.h"
 #include "linux/workqueue.h"
+#include "linux/mutex.h"
 #include "asm/uaccess.h"
 #include "init.h"
 #include "irq_kern.h"
@@ -360,7 +361,7 @@ struct unplugged_pages {
 	void *pages[UNPLUGGED_PER_PAGE];
 };
 
-static DECLARE_MUTEX(plug_mem_mutex);
+static DEFINE_MUTEX(plug_mem_mutex);
 static unsigned long long unplugged_pages_count = 0;
 static LIST_HEAD(unplugged_pages);
 static int unplug_index = UNPLUGGED_PER_PAGE;
@@ -396,7 +397,7 @@ static int mem_config(char *str, char **error_out)
 
 	diff /= PAGE_SIZE;
 
-	down(&plug_mem_mutex);
+	mutex_lock(&plug_mem_mutex);
 	for (i = 0; i < diff; i++) {
 		struct unplugged_pages *unplugged;
 		void *addr;
@@ -453,7 +454,7 @@ static int mem_config(char *str, char **error_out)
 
 	err = 0;
 out_unlock:
-	up(&plug_mem_mutex);
+	mutex_unlock(&plug_mem_mutex);
 out:
 	return err;
 }