From fa1bbdea300a15ec7c1186a5e53de33a5b1672f5 Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Thu, 10 Mar 2011 11:41:57 -0500 Subject: [PATCH] GFS2: Optimize glock multiple-dequeue code This is a small patch that optimizes multiple glock dequeue operations. It changes the unlock order to be more efficient and makes it easier for lock debugging tools to unravel. It also eliminates the need for the temp variable x, although that would likely be optimized out. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse --- fs/gfs2/glock.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 3f45a14..8648409 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -1248,10 +1248,8 @@ int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) { - unsigned int x; - - for (x = 0; x < num_gh; x++) - gfs2_glock_dq(&ghs[x]); + while (num_gh--) + gfs2_glock_dq(&ghs[num_gh]); } /** @@ -1263,10 +1261,8 @@ void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) { - unsigned int x; - - for (x = 0; x < num_gh; x++) - gfs2_glock_dq_uninit(&ghs[x]); + while (num_gh--) + gfs2_glock_dq_uninit(&ghs[num_gh]); } void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) -- 2.7.4