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authorThomas Gleixner <tglx@linutronix.de>2017-09-12 21:37:18 +0200
committerIngo Molnar <mingo@kernel.org>2017-09-14 11:41:08 +0200
commit178b9f7a36d2c74a38274b66dd89f53611298a19 (patch)
tree6ea60b3626a552baa282502b62cd19b4429889bf /include
parentwatchdog/core: Get rid of the racy update loop (diff)
downloadlinux-178b9f7a36d2c74a38274b66dd89f53611298a19.tar.xz
linux-178b9f7a36d2c74a38274b66dd89f53611298a19.zip
watchdog/hardlockup/perf: Implement init time perf validation
The watchdog tries to create perf events even after it figured out that perf is not functional or the requested event is not supported. That's braindead as this can be done once at init time and if not supported the NMI watchdog can be turned off unconditonally. Implement the perf hardlockup detector functionality for that. This creates a new event create function, which will replace the unholy mess of the existing one in later patches. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Don Zickus <dzickus@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Ulrich Obergfell <uobergfe@redhat.com> Link: http://lkml.kernel.org/r/20170912194148.019090547@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/nmi.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index eee255bc0fd6..72c62a809e92 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -93,14 +93,18 @@ extern void hardlockup_detector_perf_stop(void);
extern void hardlockup_detector_perf_restart(void);
extern void hardlockup_detector_perf_disable(void);
extern void hardlockup_detector_perf_cleanup(void);
+extern int hardlockup_detector_perf_init(void);
#else
static inline void hardlockup_detector_perf_stop(void) { }
static inline void hardlockup_detector_perf_restart(void) { }
static inline void hardlockup_detector_perf_disable(void) { }
static inline void hardlockup_detector_perf_cleanup(void) { }
-#if !defined(CONFIG_HAVE_NMI_WATCHDOG)
+# if !defined(CONFIG_HAVE_NMI_WATCHDOG)
+static inline int hardlockup_detector_perf_init(void) { return -ENODEV; }
static inline void arch_touch_nmi_watchdog(void) {}
-#endif
+# else
+static inline int hardlockup_detector_perf_init(void) { return 0; }
+# endif
#endif
void watchdog_nmi_reconfigure(bool run);