linux-kernel - Re: [PATCH net-next 01/11] atm: horizon: shut up clang null pointer arithmetic warning

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Date:   Wed, 28 Oct 2020 09:35:52 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Chas Williams <3chas3@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-atm-general@...ts.sourceforge.net,
        Networking <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH net-next 01/11] atm: horizon: shut up clang null pointer
 arithmetic warning

On Wed, Oct 28, 2020 at 1:42 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Mon, 26 Oct 2020 22:29:48 +0100 Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > Building a "W=1" kernel with clang produces a warning about
> > suspicous pointer arithmetic:
> >
> > drivers/atm/horizon.c:1844:52: warning: performing pointer arithmetic
> > on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> >   for (mem = (HDW *) memmap; mem < (HDW *) (memmap + 1); ++mem)
> >
> > The way that the addresses are handled is very obscure, and
> > rewriting it to be more conventional seems fairly pointless, given
> > that this driver probably has no users.
> > Shut up this warning by adding a cast to uintptr_t.
> >
> > Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> Hi!
>
> I'm not sure what your plan is for re-spinning but when you do could
> you please split the wireless changes out?

Sure, will do. The easiest for me would be if you just merge the ones
that have been acked or that look obvious enough for you, and I'll
then resend whatever is left after addressing the review comments.

If that causes you extra work, I'll just send everything that should go
through your tree.

> Also we never got patch 3
> IDK if that's a coincidence or if it wasn't for networking...

Yes, that one slipped in when I was sorting my longer series, it
was a block driver change.

      Arnd