linux-kernel - Re: [PATCH v6 3/5] locking/qspinlock: Introduce CNA into the slow path of qspinlock

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Date:   Fri, 15 Nov 2019 01:38:21 +0100
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Alex Kogan <alex.kogan@...cle.com>
Cc:     kbuild test robot <lkp@...el.com>, linux-sparse@...r.kernel.org,
        kbuild-all@...ts.01.org, linux@...linux.org.uk,
        Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
        will.deacon@....com, arnd@...db.de, longman@...hat.com,
        linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, bp@...en8.de,
        hpa@...or.com, x86@...nel.org, guohanjun@...wei.com,
        jglauber@...vell.com, steven.sistare@...cle.com,
        daniel.m.jordan@...cle.com, dave.dice@...cle.com,
        rahul.x.yadav@...cle.com
Subject: Re: [PATCH v6 3/5] locking/qspinlock: Introduce CNA into the slow
 path of qspinlock

On Thu, Nov 14, 2019 at 03:57:34PM -0500, Alex Kogan wrote:
> + linux-sparse mailing list
> 
> It seems like a bug in the way sparse handles “pure” functions that return
> a pointer.

Yes, it's a bug in sparse.
 
> The warnings can be eliminated by adding an explicit cast, e.g.:
> 
> 	node = (struct mcs_spinlock *)grab_mcs_node(node, idx);
> 
> but this seems wrong (unnecessary) to me.

Indeed, it would be wrong.

Thanks for analyzing and reporting this,
-- Luc