Commit-ID: 450f9689f294c331c56ec37d68302ccc19c7caa2 Gitweb: http://git.kernel.org/tip/450f9689f294c331c56ec37d68302ccc19c7caa2 Author: Marc Zyngier <marc.zyng...@arm.com> AuthorDate: Tue, 1 Aug 2017 09:02:57 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Thu, 10 Aug 2017 12:29:00 +0200
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.zyng...@arm.com> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Leo Yan <leo....@linaro.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: linux-arm-ker...@lists.infradead.org Link: http://lkml.kernel.org/r/20170801080257.5056-5-marc.zyng...@arm.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- drivers/clocksource/arm_arch_timer.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index aae87c4..c62e716 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
