linux-kernel - Re: [PATCH v2] cpuidle: Add sanity check for exit latency and target residency

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Message-ID: <a4c894d1334e587e094b7039745c792108086199.camel@linux.intel.com>
Date: Sat, 08 Nov 2025 16:07:37 +0200
From: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Linux PM <linux-pm@...r.kernel.org>, LKML
 <linux-kernel@...r.kernel.org>,  Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v2] cpuidle: Add sanity check for exit latency and
 target residency

On Sat, 2025-11-08 at 12:48 +0100, Rafael J. Wysocki wrote:
> > > +static int validate_state(struct cpuidle_state *s, struct cpuidle_state *prev_s)
> > > +{
> > > +       if (s->exit_latency == 0)
> > > +               return -EINVAL;
> > 
> > The change above will break the polling state AFAICS.

Thanks for feedback. Yes. I first implemented this in intel_idle.c,
where this made sense, but then moved to cpuidle.c and did not notice.

Thanks,
Artem.