Re: [PATCH] ARM64: smp: Silence suspicious RCU usage with ipi tracepoints

[Stephen Boyd]

On 06/24/2015 02:29 PM, Peter Zijlstra wrote:
> On Wed, Jun 24, 2015 at 01:14:18PM -0700, Stephen Boyd wrote:
>> John Stultz reported an RCU splat on ARM with ipi trace events
>> enabled. It looks like the same problem exists on ARM64.
>>
>> At this point in the IPI handling path we haven't called
>> irq_enter() yet, so RCU doesn't know that we're about to exit
>> idle and properly warns that we're using RCU from an idle CPU.
>> Use trace_ipi_entry_rcuidle() instead of trace_ipi_entry() so
>> that RCU is informed about our exit from idle.
> I have a problem with $subject. It says 'silence', whereas afaict this
> fixes an actual bug, so it should be 'fixes'.

Fair enough. I can resend or whoever applies this patch can
s/Silence/Fix/ on the $subject.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/