kernel/watchdog: move NMI function header declarations from watchdog.h to nmi.h

The kernel's NMI watchdog has nothing to do with the watchdog subsystem.
Its header declarations should be in linux/nmi.h, not linux/watchdog.h.

The code provided two sets of dummy functions if HARDLOCKUP_DETECTOR is
not configured, one in the include file and one in kernel/watchdog.c.
Remove the dummy functions from kernel/watchdog.c and use those from the
include file.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Cc: Stephane Eranian <eranian@google.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Don Zickus <dzickus@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/x86/kernel/cpu/perf_event_intel.c

@@ -12,7 +12,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/export.h>
-#include <linux/watchdog.h>
+#include <linux/nmi.h>
 
 #include <asm/cpufeature.h>
 #include <asm/hardirq.h>

include/linux/nmi.h

@@ -26,10 +26,12 @@ static inline void touch_nmi_watchdog(void)
 
 #if defined(CONFIG_HARDLOCKUP_DETECTOR)
 extern void hardlockup_detector_disable(void);
+void watchdog_nmi_disable_all(void);
+void watchdog_nmi_enable_all(void);
 #else
-static inline void hardlockup_detector_disable(void)
-{
-}
+static inline void hardlockup_detector_disable(void) {}
+static inline void watchdog_nmi_disable_all(void) {}
+static inline void watchdog_nmi_enable_all(void) {}
 #endif
 
 /*

include/linux/watchdog.h

@@ -140,12 +140,4 @@ extern int watchdog_init_timeout(struct watchdog_device *wdd,
 extern int watchdog_register_device(struct watchdog_device *);
 extern void watchdog_unregister_device(struct watchdog_device *);
 
-#ifdef CONFIG_HARDLOCKUP_DETECTOR
-void watchdog_nmi_disable_all(void);
-void watchdog_nmi_enable_all(void);
-#else
-static inline void watchdog_nmi_disable_all(void) {}
-static inline void watchdog_nmi_enable_all(void) {}
-#endif
-
 #endif  /* ifndef _LINUX_WATCHDOG_H */

kernel/watchdog.c

@@ -651,8 +651,6 @@ void watchdog_nmi_disable_all(void)
 #else
 static int watchdog_nmi_enable(unsigned int cpu) { return 0; }
 static void watchdog_nmi_disable(unsigned int cpu) { return; }
-void watchdog_nmi_enable_all(void) {}
-void watchdog_nmi_disable_all(void) {}
 #endif /* CONFIG_HARDLOCKUP_DETECTOR */
 
 static struct smp_hotplug_thread watchdog_threads = {