linux-kernel - Re: [PATCH] remove CONFIG

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Message-ID: <20220629185903.GL1790663@paulmck-ThinkPad-P17-Gen-1>
Date:   Wed, 29 Jun 2022 11:59:03 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Christoph Hellwig <hch@....de>,
        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>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        WireGuard mailing list <wireguard@...ts.zx2c4.com>,
        Netdev <netdev@...r.kernel.org>, rcu@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] remove CONFIG_ANDROID

On Wed, Jun 29, 2022 at 07:19:36PM +0200, Greg Kroah-Hartman wrote:
> On Wed, Jun 29, 2022 at 07:10:43PM +0200, Jason A. Donenfeld wrote:
> > On Wed, Jun 29, 2022 at 07:00:25PM +0200, Greg Kroah-Hartman wrote:

[ . . . ]

> > That sounds like a false dichotomy. It's not about "fix Android" vs "fix
> > distros". What I'm suggesting is fixing Android AND fixing distros, by
> > looking at the problem holistically. Trading a bad problem on Android
> > (wg connections are broken) for a manageable problem on distros (something
> > something theoretical warm boot attack something) doesn't sound like a
> > nice trade off. Let's instead get this all fixed at the same time.
> 
> Agreed, so what should we use instead in the wg code?  What userspace
> functionality are you trying to trigger off of here in the current
> CONFIG_ANDROID check?
> 
> The RCU stuff is already handled as Paul has stated, so that's not an
> issue.

To be fair, one advantage that the RCU stuff has is that it only very
recently hit mainline, so people are only just now starting to make use
of it.  Jason's code has been in for some time, so he has more existing
practice to deal with.

							Thanx, Paul