linux-kernel - Re: [PATCH 1/5] seqlock: simplify SEQCOUNT

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Message-ID: <20230921140406.GF14803@noisy.programming.kicks-ass.net>
Date:   Thu, 21 Sep 2023 16:04:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Boqun Feng <boqun.feng@...il.com>, Ingo Molnar <mingo@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Waiman Long <longman@...hat.com>,
        Will Deacon <will@...nel.org>,
        Alexey Gladkov <legion@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] seqlock: simplify SEQCOUNT_LOCKNAME()

On Thu, Sep 21, 2023 at 01:48:26PM +0200, Oleg Nesterov wrote:
> On 09/16, Peter Zijlstra wrote:
> >
> > On Wed, Sep 13, 2023 at 05:49:53PM +0200, Oleg Nesterov wrote:
> > > 1. Kill the "lockmember" argument. It is always s->lock plus
> > >    __seqprop_##lockname##_sequence() already uses s->lock and
> > >    ignores "lockmember".
> > >
> > > 2. Kill the "lock_acquire" argument. __seqprop_##lockname##_sequence()
> > >    can use the same "lockbase" prefix for _lock and _unlock.
> > >
> > > Apart from line numbers, gcc -E outputs the same code.
> >
> > With seqlock_ww_mutex gone, yes this is a nice cleanup.
> 
> Thanks.
> 
> Can you look at 2/5? To me it looks like a good cleanup too.
> I am going to resend 1/5 and 2/5, as no one is interested in
> stats_lock change.

2 seems okay. Will need a new changelog without the rest thouhg. Perhaps
talk about how it perserves the constness instead?