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| author | Oleg Nesterov <oleg@redhat.com> | 2014-12-10 15:54:45 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-10 17:41:17 -0800 |
| commit | f6507f83bccd4a5f7dc7091079bf58128dc56d66 (patch) | |
| tree | f664fee962fdd4521ec1b64143d8a0f21a32a7e0 /kernel/exit.c | |
| parent | 7f6def9f9b6ebba42fcdc12cfb3092f2cf44b3fe (diff) | |
| download | linux-f6507f83bccd4a5f7dc7091079bf58128dc56d66.tar.gz linux-f6507f83bccd4a5f7dc7091079bf58128dc56d66.tar.bz2 linux-f6507f83bccd4a5f7dc7091079bf58128dc56d66.zip | |
exit: wait: cleanup the ptrace_reparented() checks
Now that EXIT_DEAD is the terminal state we can kill "int traced"
variable and check "state == EXIT_DEAD" instead to cleanup the code. In
particular, this way it is clear that the check obviously doesn't need
tasklist_lock.
Also fix the type of "unsigned long state", "long" was always wrong
although this doesn't matter because cmpxchg/xchg uses typeof(*ptr).
[akpm@linux-foundation.org: don't make me google the C Operator Precedence table]
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sterling Alexander <stalexan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 9c9526d87276..20875d6398ae 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -973,8 +973,7 @@ static int wait_noreap_copyout(struct wait_opts *wo, struct task_struct *p, */ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p) { - unsigned long state; - int retval, status, traced; + int state, retval, status; pid_t pid = task_pid_vnr(p); uid_t uid = from_kuid_munged(current_user_ns(), task_uid(p)); struct siginfo __user *infop; @@ -999,19 +998,18 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p) } return wait_noreap_copyout(wo, p, pid, uid, why, status); } - - traced = ptrace_reparented(p); /* * Move the task's state to DEAD/TRACE, only one thread can do this. */ - state = traced && thread_group_leader(p) ? EXIT_TRACE : EXIT_DEAD; + state = (ptrace_reparented(p) && thread_group_leader(p)) ? + EXIT_TRACE : EXIT_DEAD; if (cmpxchg(&p->exit_state, EXIT_ZOMBIE, state) != EXIT_ZOMBIE) return 0; + /* - * It can be ptraced but not reparented, check - * thread_group_leader() to filter out sub-threads. + * Check thread_group_leader() to exclude the traced sub-threads. */ - if (likely(!traced) && thread_group_leader(p)) { + if (state == EXIT_DEAD && thread_group_leader(p)) { struct signal_struct *psig; struct signal_struct *sig; unsigned long maxrss; |