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Date:   Fri, 27 Apr 2018 10:30:27 +0100
From:   Mark Rutland <>
To:     Kim Phillips <>
Cc:     Ganapatrao Kulkarni <>,,,,,,,,,
Subject: Re: [PATCH v4 2/2] ThunderX2: Add Cavium ThunderX2 SoC UNCORE PMU

Hi Kim,

On Thu, Apr 26, 2018 at 05:06:24PM -0500, Kim Phillips wrote:
> On Wed, 25 Apr 2018 14:30:47 +0530
> Ganapatrao Kulkarni <> wrote:
> > +static int thunderx2_uncore_event_init(struct perf_event *event)

> This PMU driver can be made more user-friendly by not just silently
> returning an error code such as -EINVAL, but by emitting a useful
> message describing the specific error via dmesg.

As has previously been discussed on several occasions, patches which log
to dmesg in a pmu::event_init() path at any level above pr_debug() are
not acceptable -- dmesg is not intended as a mechanism to inform users
of driver-specific constraints.

I would appreciate if in future you could qualify your suggestion with
the requirement that pr_debug() is used.


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