[XFS] ktrace kt_lock is unused, remove it.

SGI-PV: 970382
SGI-Modid: xfs-linux-melb:xfs-kern:29747a
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Donald Douwsma <donaldd@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

fs/xfs/support/ktrace.c

@@ -90,8 +90,6 @@ ktrace_alloc(int nentries, unsigned int __nocast sleep)
 		return NULL;
 	}
 
-	spinlock_init(&(ktp->kt_lock), "kt_lock");
-
 	ktp->kt_entries  = ktep;
 	ktp->kt_nentries = nentries;
 	ktp->kt_index    = 0;
@@ -114,8 +112,6 @@ ktrace_free(ktrace_t *ktp)
 	if (ktp == (ktrace_t *)NULL)
 		return;
 
-	spinlock_destroy(&ktp->kt_lock);
-
 	/*
 	 * Special treatment for the Vnode trace buffer.
 	 */

fs/xfs/support/ktrace.h

@@ -31,7 +31,6 @@ typedef struct ktrace_entry {
  * Trace buffer header structure.
  */
 typedef struct ktrace {
-	lock_t		kt_lock;	/* mutex to guard counters */
 	int		kt_nentries;	/* number of entries in trace buf */
 	int		kt_index;	/* current index in entries */
 	int		kt_rollover;