linux-kernel - Re: [PATCH v5] cpu/hotplug: Do not bail-out in DYING/STARTING sections

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Message-ID: <xhsmh1qu9fcxo.mognet@vschneid.remote.csb>
Date:   Mon, 25 Jul 2022 16:07:47 +0100
From:   Valentin Schneider <vschneid@...hat.com>
To:     Vincent Donnefort <vdonnefort@...gle.com>, peterz@...radead.org,
        tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, regressions@...mhuis.info,
        kernel-team@...roid.com, Vincent Donnefort <vdonnefort@...gle.com>,
        Derek Dolney <z23@...teo.net>
Subject: Re: [PATCH v5] cpu/hotplug: Do not bail-out in DYING/STARTING sections

On 25/07/22 10:59, Vincent Donnefort wrote:
> The DYING/STARTING callbacks are not expected to fail. However, as reported
> by Derek, drivers such as tboot are still free to return errors within
> those sections, which halts the hot(un)plug and leaves the CPU in an
> unrecoverable state.
>
> No rollback being possible there, let's only log the failures and proceed
> with the following steps. This restores the hotplug behaviour prior to
> commit 453e41085183 ("cpu/hotplug: Add cpuhp_invoke_callback_range()")
>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=215867
> Fixes: 453e41085183 ("cpu/hotplug: Add cpuhp_invoke_callback_range()")
> Reported-by: Derek Dolney <z23@...teo.net>
> Signed-off-by: Vincent Donnefort <vdonnefort@...gle.com>
> Tested-by: Derek Dolney <z23@...teo.net>
>

The changelog has some undesired stowaways below, but regardless:
Reviewed-by: Valentin Schneider <vschneid@...hat.com>

> v4 -> v5:
>    - Remove WARN, only log broken states with pr_warn.
> v3 -> v4:
>    - Sorry ... wrong commit description style ...
> v2 -> v3:
>    - Tested-by tag.
>    - Refine commit description.
>    - Bugzilla link.
> v1 -> v2:
>    - Commit message rewording.
>    - More details in the warnings.
>    - Some variable renaming
>