1 files changed, 30 insertions, 0 deletions

diff --git a/include/linux/signal.h b/include/linux/signal.h
index 5dd5f02c5c5f..b7d093520bb6 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -18,6 +18,19 @@
 #define SA_PROBE                SA_ONESHOT
 #define SA_SAMPLE_RANDOM        SA_RESTART
 #define SA_SHIRQ                0x04000000
+/*
+ * As above, these correspond to the IORESOURCE_IRQ_* defines in
+ * linux/ioport.h to select the interrupt line behaviour.  When
+ * requesting an interrupt without specifying a SA_TRIGGER, the
+ * setting should be assumed to be "as already configured", which
+ * may be as per machine or firmware initialisation.
+ */
+#define SA_TRIGGER_LOW          0x00000008
+#define SA_TRIGGER_HIGH         0x00000004
+#define SA_TRIGGER_FALLING      0x00000002
+#define SA_TRIGGER_RISING       0x00000001
+#define SA_TRIGGER_MASK (SA_TRIGGER_HIGH|SA_TRIGGER_LOW|\
+                                 SA_TRIGGER_RISING|SA_TRIGGER_FALLING)
 
 /*
  * Real Time signals may be queued.
@@ -81,6 +94,23 @@ static inline int sigfindinword(unsigned long word)
 
 #endif /* __HAVE_ARCH_SIG_BITOPS */
 
+static inline int sigisemptyset(sigset_t *set)
+{
+        extern void _NSIG_WORDS_is_unsupported_size(void);
+        switch (_NSIG_WORDS) {
+        case 4:
+                return (set->sig[3] | set->sig[2] |
+                        set->sig[1] | set->sig[0]) == 0;
+        case 2:
+                return (set->sig[1] | set->sig[0]) == 0;
+        case 1:
+                return set->sig[0] == 0;
+        default:
+                _NSIG_WORDS_is_unsupported_size();
+                return 0;
+        }
+}
+
 #define sigmask(sig)    (1UL << ((sig) - 1))
 
 #ifndef __HAVE_ARCH_SIG_SETOPS