x86: nmi_watchdog - introduce nmi_watchdog_active() helper
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: macro@linux-mips.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/nmi.h b/include/asm-x86/nmi.h
index 1348e54..21f8d02 100644
--- a/include/asm-x86/nmi.h
+++ b/include/asm-x86/nmi.h
@@ -56,6 +56,19 @@
if (nmi_watchdog == NMI_IO_APIC)
nmi_watchdog = NMI_LOCAL_APIC;
}
+
+/* check if nmi_watchdog is active (ie was specified at boot) */
+static inline int nmi_watchdog_active(void)
+{
+ /*
+ * actually it should be:
+ * return (nmi_watchdog == NMI_LOCAL_APIC ||
+ * nmi_watchdog == NMI_IO_APIC)
+ * but since they are power of two we could use a
+ * cheaper way --cvg
+ */
+ return nmi_watchdog & 0x3;
+}
#endif
void lapic_watchdog_stop(void);