linux-kernel - Re: [PATCH V2] of: fix clang -Wunsequenced for be32_to

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Date:   Tue, 30 Apr 2019 09:29:12 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Phong Tran <tranmanphong@...il.com>
Cc:     robh+dt@...nel.org, Frank Rowand <frowand.list@...il.com>,
        pantelis.antoniou@...sulko.com, David.Laight@...lab.com,
        hch@...radead.org, Nathan Chancellor <natechancellor@...il.com>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH V2] of: fix clang -Wunsequenced for be32_to_cpu()

On Tue, Apr 30, 2019 at 9:28 AM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> On Tue, Apr 30, 2019 at 7:58 AM Phong Tran <tranmanphong@...il.com> wrote:
> >
> > Now, make the loop explicit to avoid clang warning.
> >
> > ./include/linux/of.h:238:37: warning: multiple unsequenced modifications
> > to 'cell' [-Wunsequenced]
> >                 r = (r << 32) | be32_to_cpu(*(cell++));
> >                                                   ^~
> > ./include/linux/byteorder/generic.h:95:21: note: expanded from macro
> > 'be32_to_cpu'
> >                     ^
> > ./include/uapi/linux/byteorder/little_endian.h:40:59: note: expanded
> > from macro '__be32_to_cpu'
> >                                                           ^
> > ./include/uapi/linux/swab.h:118:21: note: expanded from macro '__swab32'
> >         ___constant_swab32(x) :                 \
> >                            ^
> > ./include/uapi/linux/swab.h:18:12: note: expanded from macro
> > '___constant_swab32'
> >         (((__u32)(x) & (__u32)0x000000ffUL) << 24) |            \
> >                   ^
> >
> > Signed-off-by: Phong Tran <tranmanphong@...il.com>
>
> Thanks for the patch.
> Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/460
> Suggested-by: David Laight <David.Laight@...LAB.COM>

sent too soon...
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

-- 
Thanks,
~Nick Desaulniers