When utrace_get_signal() is called with interrupt || report || signal_handler,
it sets event = 0 and, unless UTRACE_SIGNAL_IGN, does the reporting. However
this is meaningless without QUIESCE in ->utrace_flags, list_for_each_entry()
will check "want & QUIESCE" anyway.
I noticed this during the testing, sometimes utrace_get_signal() returns
signr != 0 even if there are no engines with ->flag != 0. Correct, but imho
is not very clear.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
--- __UTRACE/kernel/utrace.c~8_UGS_CK_QUIESCE 2009-08-26 19:22:02.000000000
+0200
+++ __UTRACE/kernel/utrace.c 2009-08-30 20:45:41.000000000 +0200
@@ -1939,7 +1939,8 @@ int utrace_get_signal(struct task_struct
spin_unlock(&utrace->lock);
- if (unlikely(report.result == UTRACE_SIGNAL_IGN))
+ if (!(task->utrace_flags & UTRACE_EVENT(QUIESCE)) ||
+ unlikely(report.result == UTRACE_SIGNAL_IGN))
/*
* We only got here to clear utrace->signal_handler.
*/
