1 files changed, 16 insertions, 5 deletions

diff --git a/include/linux/signal.h b/include/linux/signal.h
index 2ac423bdb676..c9e65360c49a 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -63,11 +63,6 @@ static inline int sigismember(sigset_t *set, int _sig)
                 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
 }
 
-static inline int sigfindinword(unsigned long word)
-{
-        return ffz(~word);
-}
-
 #endif /* __HAVE_ARCH_SIG_BITOPS */
 
 static inline int sigisemptyset(sigset_t *set)
@@ -289,6 +284,22 @@ extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka,
 extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
 extern void signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs, int stepping);
 extern void exit_signals(struct task_struct *tsk);
+extern void kernel_sigaction(int, __sighandler_t);
+
+static inline void allow_signal(int sig)
+{
+        /*
+         * Kernel threads handle their own signals. Let the signal code
+         * 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);
+}
+
+static inline void disallow_signal(int sig)
+{
+        kernel_sigaction(sig, SIG_IGN);
+}
 
 /*
  * Eventually that'll replace get_signal_to_deliver(); macro for now,