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authorMarc Zyngier <marc.zyngier@arm.com>2017-08-01 11:02:57 +0300
committerIngo Molnar <mingo@kernel.org>2017-08-10 13:29:00 +0300
commit450f9689f294c331c56ec37d68302ccc19c7caa2 (patch)
tree44c24dfc4959328092637722e4d365288ebe4dec /drivers/clocksource
parent5a40527f8f0798553764fc8db4111d7d9c33ea51 (diff)
downloadlinux-450f9689f294c331c56ec37d68302ccc19c7caa2.tar.xz
clocksource/arm_arch_timer: Use static_branch_enable_cpuslocked()
Use the new static_branch_enable_cpuslocked() function to switch the workaround static key on the CPU hotplug path. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20170801080257.5056-5-marc.zyngier@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/arm_arch_timer.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index aae87c4c546e..c62e71614c75 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -455,7 +455,11 @@ void arch_timer_enable_workaround(const struct arch_timer_erratum_workaround *wa
per_cpu(timer_unstable_counter_workaround, i) = wa;
}
- static_branch_enable(&arch_timer_read_ool_enabled);
+ /*
+ * Use the locked version, as we're called from the CPU
+ * hotplug framework. Otherwise, we end-up in deadlock-land.
+ */
+ static_branch_enable_cpuslocked(&arch_timer_read_ool_enabled);
/*
* Don't use the vdso fastpath if errata require using the