netdev - Re: [PATCH] remove CONFIG

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Message-ID: <20220629125643.393df70d@gandalf.local.home>
Date:   Wed, 29 Jun 2022 12:56:43 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Christoph Hellwig <hch@....de>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <brauner@...nel.org>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Theodore Ts'o <tytso@....edu>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>,
        Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        wireguard@...ts.zx2c4.com, netdev@...r.kernel.org,
        rcu@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] remove CONFIG_ANDROID


[ Note, I'm not on the Android team and my response has nothing to do with
  my employer. I would say the same thing with my previous employer. ]

On Wed, 29 Jun 2022 18:45:43 +0200
Christoph Hellwig <hch@....de> wrote:

> On Wed, Jun 29, 2022 at 06:38:09PM +0200, Jason A. Donenfeld wrote:
> > On the technical topic, an Android developer friend following this
> > thread just pointed out to me that Android doesn't use PM_AUTOSLEEP and
> > just has userspace causing suspend frequently. So by his rough
> > estimation your patch actually *will* break Android devices. Zoinks.
> > Maybe he's right, maybe he's not -- I don't know -- but you should
> > probably look into this if you want this patch to land without breakage.  
> 
> And it will also "break" anyone else doing frequent suspends from
> userspace, as that behavior is still in no way related to
> CONFIG_ANDROID.

Should there then be a CONFIG_FREQUENT_SUSPENDS ?

That is, if you have system where you know that there will be a lot of
frequent suspends coming from user space, then you would enable it.

I agree, calling this ANDROID is not related to the functionality change.
But if there was a config that was related, would that be acceptable?

Then it would not just be Android that could enabled this change, but any
other system that is doing frequent suspends?

-- Steve