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exit: move core of do_wait() into helper

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Rather than have a maze of gotos, put the actual logic in __do_wait()
and have do_wait() loop deal with waitqueue setup/teardown and whether
to call __do_wait() again.

No functional changes intended in this patch.

Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-07-11 10:34:37 -06:00
parent 9d900d4ea3
commit 06a101ca45
1 changed files with 31 additions and 20 deletions
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51
kernel/exit.c
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@ -1590,16 +1590,10 @@ static int do_wait_pid(struct wait_opts *wo)
return 0;
}
static long do_wait(struct wait_opts *wo)
static long __do_wait(struct wait_opts *wo)
{
int retval;
long retval;
trace_sched_process_wait(wo->wo_pid);
init_waitqueue_func_entry(&wo->child_wait, child_wait_callback);
wo->child_wait.private = current;
add_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
repeat:
/*
* If there is nothing that can match our criteria, just get out.
* We will clear ->notask_error to zero if we see any child that
@ -1611,24 +1605,23 @@ static long do_wait(struct wait_opts *wo)
(!wo->wo_pid || !pid_has_task(wo->wo_pid, wo->wo_type)))
goto notask;
set_current_state(TASK_INTERRUPTIBLE);
read_lock(&tasklist_lock);
if (wo->wo_type == PIDTYPE_PID) {
retval = do_wait_pid(wo);
if (retval)
goto end;
return retval;
} else {
struct task_struct *tsk = current;
do {
retval = do_wait_thread(wo, tsk);
if (retval)
goto end;
return retval;
retval = ptrace_do_wait(wo, tsk);
if (retval)
goto end;
return retval;
if (wo->wo_flags & __WNOTHREAD)
break;
@ -1638,14 +1631,32 @@ static long do_wait(struct wait_opts *wo)
notask:
retval = wo->notask_error;
if (!retval && !(wo->wo_flags & WNOHANG)) {
retval = -ERESTARTSYS;
if (!signal_pending(current)) {
schedule();
goto repeat;
}
}
end:
if (!retval && !(wo->wo_flags & WNOHANG))
return -ERESTARTSYS;
return retval;
}
static long do_wait(struct wait_opts *wo)
{
int retval;
trace_sched_process_wait(wo->wo_pid);
init_waitqueue_func_entry(&wo->child_wait, child_wait_callback);
wo->child_wait.private = current;
add_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
do {
set_current_state(TASK_INTERRUPTIBLE);
retval = __do_wait(wo);
if (retval != -ERESTARTSYS)
break;
if (signal_pending(current))
break;
schedule();
} while (1);
__set_current_state(TASK_RUNNING);
remove_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
return retval;