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Merge tag 'core-entry-notify-signal' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into tif-task_work.arch

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Core changes to support TASK_NOTIFY_SIGNAL

* tag 'core-entry-notify-signal' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  task_work: Use TIF_NOTIFY_SIGNAL if available
  entry: Add support for TIF_NOTIFY_SIGNAL
  signal: Add task_sigpending() helper
This commit is contained in:
Jens Axboe
2020-11-09 07:19:32 -07:00
parent f8394f232b 114518eb64
commit 29701d69b9
10 changed files with 118 additions and 30 deletions
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22
kernel/signal.c
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@@ -984,7 +984,7 @@ static inline bool wants_signal(int sig, struct task_struct *p)
if (task_is_stopped_or_traced(p))
return false;
return task_curr(p) || !signal_pending(p);
return task_curr(p) || !task_sigpending(p);
}
static void complete_signal(int sig, struct task_struct *p, enum pid_type type)
@@ -2530,6 +2530,20 @@ bool get_signal(struct ksignal *ksig)
struct signal_struct *signal = current->signal;
int signr;
/*
* For non-generic architectures, check for TIF_NOTIFY_SIGNAL so
* that the arch handlers don't all have to do it. If we get here
* without TIF_SIGPENDING, just exit after running signal work.
*/
#ifdef TIF_NOTIFY_SIGNAL
if (!IS_ENABLED(CONFIG_GENERIC_ENTRY)) {
if (test_thread_flag(TIF_NOTIFY_SIGNAL))
tracehook_notify_signal();
if (!task_sigpending(current))
return false;
}
#endif
if (unlikely(uprobe_deny_signal()))
return false;
@@ -2823,7 +2837,7 @@ static void retarget_shared_pending(struct task_struct *tsk, sigset_t *which)
/* Remove the signals this thread can handle. */
sigandsets(&retarget, &retarget, &t->blocked);
if (!signal_pending(t))
if (!task_sigpending(t))
signal_wake_up(t, 0);
if (sigisemptyset(&retarget))
@@ -2857,7 +2871,7 @@ void exit_signals(struct task_struct *tsk)
cgroup_threadgroup_change_end(tsk);
if (!signal_pending(tsk))
if (!task_sigpending(tsk))
goto out;
unblocked = tsk->blocked;
@@ -2901,7 +2915,7 @@ long do_no_restart_syscall(struct restart_block *param)
static void __set_task_blocked(struct task_struct *tsk, const sigset_t *newset)
{
if (signal_pending(tsk) && !thread_group_empty(tsk)) {
if (task_sigpending(tsk) && !thread_group_empty(tsk)) {
sigset_t newblocked;
/* A set of now blocked but previously unblocked signals. */
sigandnsets(&newblocked, newset, &current->blocked);