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From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Date: Sun, 17 Jul 2022 23:05:04 +0100
Message-ID: <CADVatmONHx5KjODAXWjKDs6OayDr2HJQpP6_mR+xSAADX_eByw@mail.gmail.com>
Subject: Re: linux-next: Tree for Jul 14
To: Nathan Chancellor <nathan@kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, clang-built-linux <llvm@lists.linux.dev>
Content-Type: text/plain; charset="UTF-8"

Hi Nathan,

On Thu, Jul 14, 2022 at 10:24 PM Nathan Chancellor <nathan@kernel.org> wrote:
>
> Dropping the next list and Stephen as these issues are likely present on
> mainline as well.
>
> On Thu, Jul 14, 2022 at 07:26:27PM +0100, Sudip Mukherjee wrote:
> > Hi Nathan,
> >
> > On Thu, Jul 14, 2022 at 5:29 PM Nathan Chancellor <nathan@kernel.org> wrote:
> > >
> > > On Thu, Jul 14, 2022 at 05:21:32PM +0100, Sudip Mukherjee wrote:
> > > > Hi Nathan,
> > > >
> > > > On Thu, Jul 14, 2022 at 5:05 PM Nathan Chancellor <nathan@kernel.org> wrote:
> > > > >
> > > > > Hi Sudip,
> > > > >
> > > > > On Thu, Jul 14, 2022 at 12:07:06PM +0100, Sudip Mukherjee (Codethink) wrote:
> > > > > > Hi Stephen,
> > > > > >
> > > > > > On Thu, Jul 14, 2022 at 06:55:14PM +1000, Stephen Rothwell wrote:
> > > > > > > Hi all,
> > > > > > >
> > > > > > > Changes since 20220713:
> > > > > >
> > > > > > Build failures on next-20220714:
> > > > >
> > > > > <snip>
> > > > >
> >
> > <snip>
> >
> > >
> > > Sure! I am not sure that we have tested mips or powerpc allmodconfig now
> > > that I am thinking about it but we'll certainly take a look at any
> > > issues that come from them and see what we can do.
> >
> > The build errors from powerpc allmodconfig with clang:
>
> Thanks for testing!
>
> > 1)
> > Error: External symbol 'memset' referenced from prom_init.c
>
> Good to know this is not clang specific.

Ok, so clang is also trying to use memset for any array.
Linus suggested adding volatile. ref:
https://lore.kernel.org/lkml/CAHk-=whc3Uvhrmrr27xp5=oOhSDjXc5s1ZxC3B7xMYV6oj4WRQ@mail.gmail.com/
for the gcc-12 problem, and with that I can see that clang has worked
as expected and removed memset from struct prom_args. But now memset
is still there for other arrays in prom_init_mem() and others. I think
we will still need a patch for clang, and that will also work when the
gcc-12 bug is fixed.


-- 
Regards
Sudip