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Date: Wed, 24 Jun 2015 21:01:31 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Peter Zijlstra <peterz@...radead.org> Cc: Stephen Boyd <sboyd@...eaurora.org>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, John Stultz <john.stultz@...aro.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Nicolas Pitre <nicolas.pitre@...aro.org> Subject: Re: [PATCH] ARM64: smp: Silence suspicious RCU usage with ipi tracepoints On Wed, 24 Jun 2015 23:29:30 +0200 Peter Zijlstra <peterz@...radead.org> 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 <rostedt@...dmis.org> -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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