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>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/asm-x86/nmi.h b/include/asm-x86/nmi.h
index 1348e542360f..21f8d0202a82 100644
--- a/include/asm-x86/nmi.h
+++ b/include/asm-x86/nmi.h
@@ -56,6 +56,19 @@ static inline void localise_nmi_watchdog(void)
         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);