Commit b787f7ba authored by Roland McGrath's avatar Roland McGrath Committed by Linus Torvalds

tracehook: force signal_pending()

This defines a new hook tracehook_force_sigpending() that lets tracing
code decide to force TIF_SIGPENDING on in recalc_sigpending().

This is not used yet, so it compiles away to nothing for now.  It lays the
groundwork for new tracing code that can interrupt a task synthetically
without actually sending a signal.
Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2b2a1ff6
...@@ -422,6 +422,20 @@ static inline int tracehook_consider_fatal_signal(struct task_struct *task, ...@@ -422,6 +422,20 @@ static inline int tracehook_consider_fatal_signal(struct task_struct *task,
return (task_ptrace(task) & PT_PTRACED) != 0; return (task_ptrace(task) & PT_PTRACED) != 0;
} }
/**
* tracehook_force_sigpending - let tracing force signal_pending(current) on
*
* Called when recomputing our signal_pending() flag. Return nonzero
* to force the signal_pending() flag on, so that tracehook_get_signal()
* will be called before the next return to user mode.
*
* Called with @current->sighand->siglock held.
*/
static inline int tracehook_force_sigpending(void)
{
return 0;
}
/** /**
* tracehook_get_signal - deliver synthetic signal to traced task * tracehook_get_signal - deliver synthetic signal to traced task
* @task: @current * @task: @current
......
...@@ -134,7 +134,9 @@ void recalc_sigpending_and_wake(struct task_struct *t) ...@@ -134,7 +134,9 @@ void recalc_sigpending_and_wake(struct task_struct *t)
void recalc_sigpending(void) void recalc_sigpending(void)
{ {
if (!recalc_sigpending_tsk(current) && !freezing(current)) if (unlikely(tracehook_force_sigpending()))
set_thread_flag(TIF_SIGPENDING);
else if (!recalc_sigpending_tsk(current) && !freezing(current))
clear_thread_flag(TIF_SIGPENDING); clear_thread_flag(TIF_SIGPENDING);
} }
......
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