diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2013-01-21 20:47:41 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-02-20 03:15:29 +0000 |
| commit | bb24eda9eee7a1cc865bb10dbb89edf7c1f5cdc7 (patch) | |
| tree | 46c5fb64621fe3e810c5b183ecddaeb99b01dcc9 /kernel/signal.c | |
| parent | 667958738244e5be2cb1e05ab1f2a112c52e1c64 (diff) | |
| download | kernel_samsung_smdk4412-bb24eda9eee7a1cc865bb10dbb89edf7c1f5cdc7.zip kernel_samsung_smdk4412-bb24eda9eee7a1cc865bb10dbb89edf7c1f5cdc7.tar.gz kernel_samsung_smdk4412-bb24eda9eee7a1cc865bb10dbb89edf7c1f5cdc7.tar.bz2 | |
ptrace: introduce signal_wake_up_state() and ptrace_signal_wake_up()
commit 910ffdb18a6408e14febbb6e4b6840fd2c928c82 upstream.
Cleanup and preparation for the next change.
signal_wake_up(resume => true) is overused. None of ptrace/jctl callers
actually want to wakeup a TASK_WAKEKILL task, but they can't specify the
necessary mask.
Turn signal_wake_up() into signal_wake_up_state(state), reintroduce
signal_wake_up() as a trivial helper, and add ptrace_signal_wake_up()
which adds __TASK_TRACED.
This way ptrace_signal_wake_up() can work "inside" ptrace_request()
even if the tracee doesn't have the TASK_WAKEKILL bit set.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'kernel/signal.c')
| -rw-r--r-- | kernel/signal.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 08e0b97..389b366 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -676,23 +676,17 @@ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) * No need to set need_resched since signal event passing * goes through ->blocked */ -void signal_wake_up(struct task_struct *t, int resume) +void signal_wake_up_state(struct task_struct *t, unsigned int state) { - unsigned int mask; - set_tsk_thread_flag(t, TIF_SIGPENDING); - /* - * For SIGKILL, we want to wake it up in the stopped/traced/killable + * TASK_WAKEKILL also means wake it up in the stopped/traced/killable * case. We don't check t->state here because there is a race with it * executing another processor and just now entering stopped state. * By using wake_up_state, we ensure the process will wake up and * handle its death signal. */ - mask = TASK_INTERRUPTIBLE; - if (resume) - mask |= TASK_WAKEKILL; - if (!wake_up_state(t, mask)) + if (!wake_up_state(t, state | TASK_INTERRUPTIBLE)) kick_process(t); } @@ -841,7 +835,7 @@ static void ptrace_trap_notify(struct task_struct *t) assert_spin_locked(&t->sighand->siglock); task_set_jobctl_pending(t, JOBCTL_TRAP_NOTIFY); - signal_wake_up(t, t->jobctl & JOBCTL_LISTENING); + ptrace_signal_wake_up(t, t->jobctl & JOBCTL_LISTENING); } /* |