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Date:	Wed, 24 Jun 2015 21:01:31 -0400
From:	Steven Rostedt <>
To:	Peter Zijlstra <>
Cc:	Stephen Boyd <>,
	Catalin Marinas <>,
	Will Deacon <>,,,
	John Stultz <>,
	"Paul E. McKenney" <>,
	Nicolas Pitre <>
Subject: Re: [PATCH] ARM64: smp: Silence suspicious RCU usage with ipi

On Wed, 24 Jun 2015 23:29:30 +0200
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'.

Agreed, otherwise Acked-by: Steven Rostedt <>

-- Steve
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