From 64a16caf5e3417ee32f670debcb5857b02a9e08e Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Wed, 17 Jun 2009 16:27:40 -0700 Subject: [PATCH] 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 Cc: Ingo Molnar Acked-by: Roland McGrath Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/exit.c | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-) diff --git a/kernel/exit.c b/kernel/exit.c index 29622e468b7f..9c6881a0a8b4 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; -- 2.20.1