linux-kernel - Re: [PATCH locking/atomic 18/19] locking/atomic: Refrain from generating duplicate fallback kernel-doc

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Message-ID: <ZF48uBYKczItubrU@FVFF77S0Q05N>
Date:   Fri, 12 May 2023 14:18:48 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, akiyks@...il.com,
        linux-doc@...r.kernel.org, kernel-team@...a.com,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH locking/atomic 18/19] locking/atomic: Refrain from
 generating duplicate fallback kernel-doc

On Thu, May 11, 2023 at 12:12:16PM -0700, Paul E. McKenney wrote:
> On Thu, May 11, 2023 at 06:10:00PM +0100, Mark Rutland wrote:
> > I think that we can restructure the ifdeffery so that each ordering variant
> > gets its own ifdeffery, and then we could place the kerneldoc immediately above
> > that, e.g.
> > 
> > 	/**
> > 	 * arch_atomic_inc_return_release()
> > 	 *
> > 	 * [ full kerneldoc block here ]
> > 	 */
> > 	#if defined(arch_atomic_inc_return_release)
> > 	/* defined in arch code */
> > 	#elif defined(arch_atomic_inc_return_relaxed)
> > 	[ define in terms of arch_atomic_inc_return_relaxed ]
> > 	#elif defined(arch_atomic_inc_return)
> > 	[ define in terms of arch_atomic_inc_return ]
> > 	#else
> > 	[ define in terms of arch_atomic_fetch_inc_release ]
> > 	#endif
> > 
> > ... with similar for the mandatory ops that each arch must provide, e.g.
> > 
> > 	/**
> > 	 * arch_atomic_or()
> > 	 *
> > 	 * [ full kerneldoc block here ]
> > 	 */
> > 	/* arch_atomic_or() is mandatory -- architectures must define it! */
> > 
> > I had a go at that restructuring today, and while local build testing indicates
> > I haven't got it quite right, I think it's possible:
> > 
> >   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=atomics/fallback-rework
> > 
> > Does that sound ok to you?
> 
> At first glance, it appears that your "TODO" locations have the same
> information that I was using, so it should not be hard for me to adapt the
> current kernel-doc generation to your new scheme.  (Famous last words!)

Great!

> Plus having the kernel-doc generation all in one place does have some
> serious attractions.

:)

> I will continue maintaining my current stack, but would of course be
> happy to port it on top of your refactoring.  If it turns out that
> the refactoring will take a long time, we can discuss what to do in
> the meantime.  But here is hoping that the refactoring goes smoothly!
> That would be easier all around.  ;-)

FWIW, I think that's working now; every cross-build I've tried works.

I've updated the branch at:

  https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=atomics/fallback-rework

Tagged as:

  atomics-fallback-rework-20230512

Thanks,
Mark.