[PATCH] revert "Optimize sys_times for a single thread process"

This patch reverts 'CONFIG_SMP && thread_group_empty()' optimization in
sys_times().  The reason is that the next patch breaks memory ordering which
is needed for that optimization.

tasklist_lock in sys_times() will be eliminated completely by further patch.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 5 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 3823ec89d7b8..6b2e4cf3e140 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -139,11 +139,7 @@ repeat:
         ptrace_unlink(p);
         BUG_ON(!list_empty(&p->ptrace_list) || !list_empty(&p->ptrace_children));
         __exit_signal(p);
-        /*
-         * Note that the fastpath in sys_times depends on __exit_signal having
-         * updated the counters before a task is removed from the tasklist of
-         * the process by __unhash_process.
-         */
+
         __unhash_process(p);
 
         /*