Gitweb: http://git.kernel.org/linus/64a16caf5e3417ee32f670debcb5857b02a9e08e
Commit: 64a16caf5e3417ee32f670debcb5857b02a9e08e
Parent: 9e8ae01d1c86dcaa6443c897662545d088036e4c
Author: Oleg Nesterov <oleg@redhat.com>
AuthorDate: Wed Jun 17 16:27:40 2009 -0700
Committer: Linus Torvalds <torvalds@linux-foundation.org>
CommitDate: Thu Jun 18 13:03:53 2009 -0700
do_wait: simplify retval/tsk_result/notask_error mess
Now that we don't pass &retval down to other helpers we can simplify
the code more.
- kill tsk_result, just use retval
- add the "notask" label right after the main loop, and
s/got end/goto notask/ after the fastpath pid check.
This way we don't need to initialize retval before this
check and the code becomes a bit more clean, if this pid
has no attached tasks we should just skip the list search.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
kernel/exit.c | 20 ++++++++------------
1 files changed, 8 insertions(+), 12 deletions(-)
diff --git a/kernel/exit.c b/kernel/exit.c
index 29622e4..9c6881a 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1576,27 +1576,22 @@ repeat:
* might later match our criteria, even if we are not able to reap
* it yet.
*/
- retval = wo->notask_error = -ECHILD;
+ wo->notask_error = -ECHILD;
if ((wo->wo_type < PIDTYPE_MAX) &&
(!wo->wo_pid || hlist_empty(&wo->wo_pid->tasks[wo->wo_type])))
- goto end;
+ goto notask;
current->state = TASK_INTERRUPTIBLE;
read_lock(&tasklist_lock);
tsk = current;
do {
- int tsk_result = do_wait_thread(wo, tsk);
-
- if (!tsk_result)
- tsk_result = ptrace_do_wait(wo, tsk);
+ retval = do_wait_thread(wo, tsk);
+ if (retval)
+ goto end;
- if (tsk_result) {
- /*
- * tasklist_lock is unlocked and we have a final result.
- */
- retval = tsk_result;
+ retval = ptrace_do_wait(wo, tsk);
+ if (retval)
goto end;
- }
if (wo->wo_flags & __WNOTHREAD)
break;
@@ -1605,6 +1600,7 @@ repeat:
} while (tsk != current);
read_unlock(&tasklist_lock);
+notask:
retval = wo->notask_error;
if (!retval && !(wo->wo_flags & WNOHANG)) {
retval = -ERESTARTSYS;
--
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