linux-kernel - RE: AW: [PATCH] amd64: Fix csum_partial_copy

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Message-ID: <2a4555bf640e4bc4b76e1ae14e5cb5e1@AcuMS.aculab.com>
Date:   Mon, 23 Oct 2023 08:16:59 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Al Viro' <viro@...iv.linux.org.uk>
CC:     Eric Dumazet <edumazet@...gle.com>,
        gus Gusenleitner Klaus <gus@...a.com>,
        Al Viro <viro@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "dsahern@...nel.org" <dsahern@...nel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: RE: AW: [PATCH] amd64: Fix csum_partial_copy_generic()

From: Al Viro
> Sent: 22 October 2023 12:12
> 
> On Sun, Oct 22, 2023 at 11:03:39AM +0000, David Laight wrote:
> 
> > > +			return -1;
> >
> > If you are going to return -1 the return type should be signed.
> 
> It's a perfectly valid C to have return -1 in a function that
> returns unsigned long long (or any other unsigned type, really)...

It is also valid C to return a pointer :-)

I also suspect that sparse will complain massively and
require a lot of the horrid (__force) casts.
(They should really be a function so that they are completely
ignored by the compiler - unless the compiler needs a cast as well.)

	David

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