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| author |   Thomas Gleixner <tglx@linutronix.de> | 2017-10-03 16:37:53 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-10-04 10:53:54 +0200 |
| commit | e31d6883f21c1cdfe5bc64e28411f8a92b783fde (patch) | |
| tree | b027de413e024bea4f8e88d364b7413bc20ac9b3 /arch | |
| parent | watchdog/core, powerpc: Replace watchdog_nmi_reconfigure() (diff) | |
| download | linux-dev-e31d6883f21c1cdfe5bc64e28411f8a92b783fde.tar.xz linux-dev-e31d6883f21c1cdfe5bc64e28411f8a92b783fde.zip | |
watchdog/core, powerpc: Lock cpus across reconfiguration
Instead of dropping the cpu hotplug lock after stopping NMI watchdog and
threads and reaquiring for restart, the code and the protection rules
become more obvious when holding cpu hotplug lock across the full
reconfiguration.
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1710022105570.2114@nanos
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/watchdog.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/watchdog.c b/arch/powerpc/kernel/watchdog.c index 2673ec8bec00..f9b4c6352d24 100644 --- a/arch/powerpc/kernel/watchdog.c +++ b/arch/powerpc/kernel/watchdog.c @@ -359,21 +359,17 @@ void watchdog_nmi_stop(void) { int cpu; - cpus_read_lock(); for_each_cpu(cpu, &wd_cpus_enabled) stop_wd_on_cpu(cpu); - cpus_read_unlock(); } void watchdog_nmi_start(void) { int cpu; - cpus_read_lock(); watchdog_calc_timeouts(); for_each_cpu_and(cpu, cpu_online_mask, &watchdog_cpumask) start_wd_on_cpu(cpu); - cpus_read_unlock(); } /* |