linux-kernel - Re: [PATCH] locking/arch: Move qrwlock.h include after qspinlock.h

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Date:   Wed, 10 Feb 2021 09:33:53 -0800
From:   Ben Gardon <bgardon@...gle.com>
To:     Waiman Long <longman@...hat.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Subject: Re: [PATCH] locking/arch: Move qrwlock.h include after qspinlock.h

On Wed, Feb 10, 2021 at 7:54 AM Waiman Long <longman@...hat.com> wrote:
>
> On 2/10/21 10:05 AM, Guenter Roeck wrote:
> > On 2/10/21 6:45 AM, Waiman Long wrote:
> >> The queued rwlock code has a dependency on the current spinlock
> >> implementation (likely to be qspinlock), but not vice versa. Including
> >> qrwlock.h before qspinlock.h can be problematic when expanding qrwlock
> >> functionality.
> >>
> >> If both qspinlock.h and qrwlock.h are to be included, the qrwlock.h
> >> include should always be after qspinlock.h. Update the current set of
> >> asm/spinlock.h files to enforce that.
> >>
> >> Signed-off-by: Waiman Long <longman@...hat.com>
> > There should be a Fixes: tag here. If the SHA of the offending commit is not
> > stable, there should be a better reference than "The queued rwlock code".
> I originally have a Fixes tag when I was modifying the mips'
> asm/spinlock.h file. After I realize that there are more files to
> modify, I take that out. Anyway, the problem was exposed by Ben's
> qrwlock patch. So existing stable releases should still be fine without
> this patch.
> >
> > This patch fixes the build problem I had observed on mips. I also tested
> > xtensa:defconfig and arm64:defconfig with no problems observed.
> >
> > Tested-by: Guenter Roeck <linux@...ck-us.net>
>
> Thanks for the testing as I don't have a build environment to verify that.
>
> Cheers,
> Longman
>

Thanks Longman and Guenter for developing and testing this fix! I
don't have the environment to test this either, but the patch looks
good to me.
Reviewed-by: Ben Gardon <bgardon@...gle.com>