1 files changed, 14 insertions, 1 deletions

diff --git a/include/linux/signal.h b/include/linux/signal.h
index b5d99482d3fe..1a5f88316b08 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -282,6 +282,9 @@ extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
 extern void exit_signals(struct task_struct *tsk);
 extern void kernel_sigaction(int, __sighandler_t);
 
+#define SIG_KTHREAD ((__force __sighandler_t)2)
+#define SIG_KTHREAD_KERNEL ((__force __sighandler_t)3)
+
 static inline void allow_signal(int sig)
 {
         /*
@@ -289,7 +292,17 @@ static inline void allow_signal(int sig)
          * know it'll be handled, so that they don't get converted to
          * SIGKILL or just silently dropped.
          */
-        kernel_sigaction(sig, (__force __sighandler_t)2);
+        kernel_sigaction(sig, SIG_KTHREAD);
+}
+
+static inline void allow_kernel_signal(int sig)
+{
+        /*
+         * Kernel threads handle their own signals. Let the signal code
+         * know signals sent by the kernel will be handled, so that they
+         * don't get silently dropped.
+         */
+        kernel_sigaction(sig, SIG_KTHREAD_KERNEL);
 }
 
 static inline void disallow_signal(int sig)