linux-kernel - Re: [PATCH AUTOSEL 5.9 28/39] intel_idle: Fix intel

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Message-ID: <20201203171035.GO2414@hirez.programming.kicks-ass.net>
Date:   Thu, 3 Dec 2020 18:10:35 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.9 28/39] intel_idle: Fix intel_idle() vs tracing

On Thu, Dec 03, 2020 at 08:28:22AM -0500, Sasha Levin wrote:
> From: Peter Zijlstra <peterz@...radead.org>
> 
> [ Upstream commit 6e1d2bc675bd57640f5658a4a657ae488db4c204 ]
> 
> cpuidle->enter() callbacks should not call into tracing because RCU
> has already been disabled. Instead of doing the broadcast thing
> itself, simply advertise to the cpuidle core that those states stop
> the timer.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Link: https://lkml.kernel.org/r/20201123143510.GR3021@hirez.programming.kicks-ass.net
> Signed-off-by: Sasha Levin <sashal@...nel.org>

This patch has a known compile issue, fix is pending.