Btrfs: stop spinning on mutex_trylock and let the adaptive code spin for us

Mutexes now spin internally and the btrfs spin is no longer required for
performance.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 10 deletions

diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index 39bae7761db6..40ba8e8962f8 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -37,16 +37,6 @@
 
 int btrfs_tree_lock(struct extent_buffer *eb)
 {
-        int i;
-
-        if (mutex_trylock(&eb->mutex))
-                return 0;
-        for (i = 0; i < 512; i++) {
-                cpu_relax();
-                if (mutex_trylock(&eb->mutex))
-                        return 0;
-        }
-        cpu_relax();
         mutex_lock_nested(&eb->mutex, BTRFS_MAX_LEVEL - btrfs_header_level(eb));
         return 0;
 }