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kill my_ptrace_child()

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Now that my_ptrace_child() is trivial we can use the "p->ptrace & PT_PTRACED"
inline and simplify the corresponding logic in do_wait: we can't find the
child in TASK_TRACED state without PT_PTRACED flag set, ptrace_untrace()
either sets TASK_STOPPED or wakes up the tracee.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-02-08 04:18:59 -08:00 committed by Linus Torvalds
parent 6b39c7bfbd
commit 34a1738f7d
1 changed files with 3 additions and 20 deletions
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23
kernel/exit.c
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@ -1511,12 +1511,6 @@ static int wait_task_continued(struct task_struct *p, int noreap,
return retval;
}
static inline int my_ptrace_child(struct task_struct *p)
{
return p->ptrace & PT_PTRACED;
}
static long do_wait(pid_t pid, int options, struct siginfo __user *infop,
int __user *stat_addr, struct rusage __user *ru)
{
@ -1555,22 +1549,11 @@ repeat:
/*
* It's stopped now, so it might later
* continue, exit, or stop again.
*
* When we hit the race with PTRACE_ATTACH, we
* will not report this child. But the race
* means it has not yet been moved to our
* ptrace_children list, so we need to set the
* flag here to avoid a spurious ECHILD when
* the race happens with the only child.
*/
flag = 1;
if (!my_ptrace_child(p)) {
if (task_is_traced(p))
continue;
if (!(options & WUNTRACED))
continue;
}
if (!(p->ptrace & PT_PTRACED) &&
!(options & WUNTRACED))
continue;
retval = wait_task_stopped(p, ret == 2,
(options & WNOWAIT), infop,