linux-kernel - Re: [PATCH] pm/sleep: Add PM_USERSPACE

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Message-ID: <CAC_TJvdV9bU2xWpbgrQuyrr6ens9gzDnZT2UzAY6Q6ZN9p7aEw@mail.gmail.com>
Date:   Thu, 30 Jun 2022 13:41:40 -0700
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     John Stultz <jstultz@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "T.J. Mercier" <tjmercier@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        "Theodore Ts'o" <tytso@....edu>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        LKML <linux-kernel@...r.kernel.org>, wireguard@...ts.zx2c4.com,
        netdev@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH] pm/sleep: Add PM_USERSPACE_AUTOSLEEP Kconfig

On Thu, Jun 30, 2022 at 12:49 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> Hi Kalesh,
>
> On Thu, Jun 30, 2022 at 07:12:29PM +0000, Kalesh Singh wrote:
> > Systems that initiate frequent suspend/resume from userspace
> > can make the kernel aware by enabling PM_USERSPACE_AUTOSLEEP
> > config.
> >
> > This allows for certain sleep-sensitive code (wireguard/rng) to
> > decide on what preparatory work should be performed (or not) in
> > their pm_notification callbacks.
> >
> > This patch was prompted by the discussion at [1] which attempts
> > to remove CONFIG_ANDROID that currently guards these code paths.
> >
> > [1] https://lore.kernel.org/r/20220629150102.1582425-1-hch@lst.de/
> >
> > Suggested-by: Jason A. Donenfeld <Jason@...c4.com>
> > Signed-off-by: Kalesh Singh <kaleshsingh@...gle.com>
>
> Thanks, looks good to me. Do you have a corresponding Gerrit link to the
> change adding this to the base Android kernel config? If so, have my
> Ack:
>
>     Acked-by: Jason A. Donenfeld <Jason@...c4.com>

Hi Jason,

Our latest supported kernels in Android are based on 5.15 so the
config change isn't yet needed. Once there are newer versions with the
CONFIG_ANDROID removed I will add this to the defconfig.

Thanks,
Kalesh

>
> Jason
>
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