linux-kernel - Re: [PATCH 1/3] Revert "cpu/hotplug: Ignore pm_wakeup_pending() for disable_nonboot

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Date:   Wed, 29 Apr 2020 12:40:18 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Qais Yousef <qais.yousef@....com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Todd E Brandt <todd.e.brandt@...ux.intel.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] Revert "cpu/hotplug: Ignore pm_wakeup_pending() for disable_nonboot_cpus()"

On Mon, Apr 27, 2020 at 12:29 PM Qais Yousef <qais.yousef@....com> wrote:
>
> On 04/26/20 17:24, Rafael J. Wysocki wrote:
> > I would do this the other way around:
> >
> > 1. Make x86 call freeze_secondary_cpus() directly, rename
> >    enable_nonboot_cpus() and drop disable_nonboot_cpus().
>
> All of this in a single patch?

Well, why not?

Calling freeze_secondary_cpus() directly causes disable_nonboot_cpus()
to be unused (and so it can be dropped in the same patch) and it also
introduces a name mismatch between freeze_ and enable_, which IMO
needs to be addressed right away (also in the same patch).

> > 2. Get rid of __freeze_secondary_cpus().
>
> I guess you're implying to drop the revert too and manually unroll it instead.

IMO the revert is just an extra step with no real value, so why do it?

> Could do.

Thanks!