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Subject[PATCH] use unlikely() for current_kernel_time() loop
I just noticed this minor optimization. current_kernel_time() is called
from current_fs_time() so it is used fairly often but it doesn't use
unlikely(read_seqretry(&xtime_lock, seq)) as other users of xtime_lock do.
Also removes extra whitespace on the empty line above.

Signed-off-by: Andreas Dilger <>

--- ./kernel/time.c.orig 2006-05-08 15:40:43.000000000 -0600
+++ ./kernel/time.c 2006-06-07 11:24:49.000000000 -0600
@@ -424,9 +424,9 @@ inline struct timespec current_kernel_time

do {
seq = read_seqbegin(&xtime_lock);
now = xtime;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (unlikely(read_seqretry(&xtime_lock, seq)));

return now;
Cheers, Andreas
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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