Subject: spufs: turn run_sema into run_mutex

From: Christoph Hellwig <hch@lst.de>
There is no reason for run_sema to be a struct semaphore.  Changing
it to a mutex and rename it accordingly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

Index: linux-cg/arch/powerpc/platforms/cell/spufs/context.c
===================================================================
--- linux-cg.orig/arch/powerpc/platforms/cell/spufs/context.c
+++ linux-cg/arch/powerpc/platforms/cell/spufs/context.c
@@ -45,7 +45,7 @@ struct spu_context *alloc_spu_context(st
 	spin_lock_init(&ctx->mapping_lock);
 	kref_init(&ctx->kref);
 	mutex_init(&ctx->state_mutex);
-	init_MUTEX(&ctx->run_sema);
+	mutex_init(&ctx->run_mutex);
 	init_waitqueue_head(&ctx->ibox_wq);
 	init_waitqueue_head(&ctx->wbox_wq);
 	init_waitqueue_head(&ctx->stop_wq);
Index: linux-cg/arch/powerpc/platforms/cell/spufs/run.c
===================================================================
--- linux-cg.orig/arch/powerpc/platforms/cell/spufs/run.c
+++ linux-cg/arch/powerpc/platforms/cell/spufs/run.c
@@ -293,7 +293,7 @@ long spufs_run_spu(struct file *file, st
 	struct spu * spu;
 	u32 status;
 
-	if (down_interruptible(&ctx->run_sema))
+	if (mutex_lock_interruptible(&ctx->run_mutex))
 		return -ERESTARTSYS;
 
 	ctx->ops->master_start(ctx);
@@ -377,6 +377,6 @@ out2:
 
 out:
 	*event = ctx->event_return;
-	up(&ctx->run_sema);
+	mutex_unlock(&ctx->run_mutex);
 	return ret;
 }
Index: linux-cg/arch/powerpc/platforms/cell/spufs/spufs.h
===================================================================
--- linux-cg.orig/arch/powerpc/platforms/cell/spufs/spufs.h
+++ linux-cg/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -61,7 +61,7 @@ struct spu_context {
 
 	enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
 	struct mutex state_mutex;
-	struct semaphore run_sema;
+	struct mutex run_mutex;
 
 	struct mm_struct *owner;