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authorThomas Gleixner <tglx@linutronix.de>2017-09-12 21:37:23 +0200
committerIngo Molnar <mingo@kernel.org>2017-09-14 11:41:09 +0200
commitab5fe3ff38ff9653490910cc71dbbedc95a86e41 (patch)
tree5855447efbd40d5019ebe10aae80bc7b262bb9b4 /arch/powerpc
parenta33d44843d4574ec05bec39527d8a87b7af2072c (diff)
downloadop-kernel-dev-ab5fe3ff38ff9653490910cc71dbbedc95a86e41.zip
op-kernel-dev-ab5fe3ff38ff9653490910cc71dbbedc95a86e41.tar.gz
watchdog/hardlockup: Clean up hotplug locking mess
All watchdog thread related functions are delegated to the smpboot thread infrastructure, which handles serialization against CPU hotplug correctly. The sysctl interface is completely decoupled from anything which requires CPU hotplug protection. No need to protect the sysctl writes against cpu hotplug anymore. Remove it and add the now required protection to the powerpc arch_nmi_watchdog implementation. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Don Zickus <dzickus@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Ulrich Obergfell <uobergfe@redhat.com> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/20170912194148.418497420@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/watchdog.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/watchdog.c b/arch/powerpc/kernel/watchdog.c
index 291af79..dfb0677 100644
--- a/arch/powerpc/kernel/watchdog.c
+++ b/arch/powerpc/kernel/watchdog.c
@@ -359,6 +359,7 @@ void watchdog_nmi_reconfigure(bool run)
{
int cpu;
+ cpus_read_lock();
if (!run) {
for_each_cpu(cpu, &wd_cpus_enabled)
stop_wd_on_cpu(cpu);
@@ -367,6 +368,7 @@ void watchdog_nmi_reconfigure(bool run)
for_each_cpu_and(cpu, cpu_online_mask, &watchdog_cpumask)
start_wd_on_cpu(cpu);
}
+ cpus_read_unlock();
}
/*
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