signals: set_restore_sigmask TIF_SIGPENDING

[safe/jmp/linux-2.6] / include / linux / thread_info.h

diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index 43d8162..81c5f82 100644 (file)
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -97,11 +97,17 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
  * set_restore_sigmask() - make sure saved_sigmask processing gets done
  *
  * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
- * will run before returning to user mode, to process the flag.
+ * will run before returning to user mode, to process the flag.  For
+ * all callers, TIF_SIGPENDING is already set or it's no harm to set
+ * it.  TIF_RESTORE_SIGMASK need not be in the set of bits that the
+ * arch code will notice on return to user mode, in case those bits
+ * are scarce.  We set TIF_SIGPENDING here to ensure that the arch
+ * signal code always gets run when TIF_RESTORE_SIGMASK is set.
  */
 static inline void set_restore_sigmask(void)
 {
        set_thread_flag(TIF_RESTORE_SIGMASK);
+       set_thread_flag(TIF_SIGPENDING);
 }
 #endif /* TIF_RESTORE_SIGMASK */