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| author |   Stephane Eranian <eranian@google.com> | 2014-11-17 20:07:03 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2015-04-02 17:33:15 +0200 |
| commit | b3738d29323344da3017a91010530cf3a58590fc (patch) | |
| tree | 0e8e97b896673ca3f2656c88e322c5def01cef69 /kernel/watchdog.c | |
| parent | perf/x86/intel: Limit to half counters when the HT workaround is enabled, to avoid exclusive mode starvation (diff) | |
| download | linux-dev-b3738d29323344da3017a91010530cf3a58590fc.tar.xz linux-dev-b3738d29323344da3017a91010530cf3a58590fc.zip | |
watchdog: Add watchdog enable/disable all functions
This patch adds two new functions to enable/disable
the watchdog across all CPUs.
This will be used by the HT PMU bug workaround code to
disable/enable the NMI watchdog across quirk enablement.
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: bp@alien8.de
Cc: jolsa@redhat.com
Cc: kan.liang@intel.com
Cc: maria.n.dimakopoulou@gmail.com
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1416251225-17721-12-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/watchdog.c')
| -rw-r--r-- | kernel/watchdog.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 3174bf8e3538..9a056f5bc02c 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -567,9 +567,37 @@ static void watchdog_nmi_disable(unsigned int cpu) cpu0_err = 0; } } + +void watchdog_nmi_enable_all(void) +{ + int cpu; + + if (!watchdog_user_enabled) + return; + + get_online_cpus(); + for_each_online_cpu(cpu) + watchdog_nmi_enable(cpu); + put_online_cpus(); +} + +void watchdog_nmi_disable_all(void) +{ + int cpu; + + if (!watchdog_running) + return; + + get_online_cpus(); + for_each_online_cpu(cpu) + watchdog_nmi_disable(cpu); + put_online_cpus(); +} #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 = { |