jbd2: Convert jbd2_slab_create_sem to mutex

[Thomas Gleixner <tglx@linutronix.de>]

jbd2_slab_create_sem is used as a mutex, so make it one.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 fs/jbd2/journal.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Index: linux-next/fs/jbd2/journal.c
===================================================================
--- linux-next.orig/fs/jbd2/journal.c
+++ linux-next/fs/jbd2/journal.c
@@ -1838,7 +1838,7 @@ size_t journal_tag_bytes(journal_t *jour
  */
 #define JBD2_MAX_SLABS 8
 static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS];
-static DECLARE_MUTEX(jbd2_slab_create_sem);
+static DEFINE_MUTEX(jbd2_slab_create_mutex);
 
 static const char *jbd2_slab_names[JBD2_MAX_SLABS] = {
 	"jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k",
@@ -1870,16 +1870,16 @@ static int jbd2_journal_create_slab(size
 
 	if (unlikely(i < 0))
 		i = 0;
-	down(&jbd2_slab_create_sem);
+	mutex_lock(&jbd2_slab_create_mutex);
 	if (jbd2_slab[i]) {
-		up(&jbd2_slab_create_sem);
+		mutex_unlock(&jbd2_slab_create_mutex);
 		return 0;	/* Already created */
 	}
 
 	slab_size = 1 << (i+10);
 	jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size,
 					 slab_size, 0, NULL);
-	up(&jbd2_slab_create_sem);
+	mutex_unlock(&jbd2_slab_create_mutex);
 	if (!jbd2_slab[i]) {
 		printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n");
 		return -ENOMEM;