linux-kernel - Re: [PATCH 2/2] build_bug.h: remove all dummy BUILD_BUG

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Message-ID: <CAK7LNAQQE+dexoqsrkxnHNf3J1o83PkHD1vf7RUKYFN1QugBJw@mail.gmail.com>
Date:   Mon, 19 Nov 2018 19:37:46 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] build_bug.h: remove all dummy BUILD_BUG_ON stubs for sparse

On Sat, Nov 17, 2018 at 7:56 PM kbuild test robot <lkp@...el.com> wrote:
>
> Hi Masahiro,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on v4.20-rc2 next-20181116]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/Masahiro-Yamada/build_bug-h-remove-negative-array-fallback-for-BUILD_BUG_ON/20181116-190414
> config: x86_64-allmodconfig (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=x86_64


OK, I was digging into this Sparse warning.

I suspect this is a bug of Sparse.

I submitted this to disable __builtin_types_compatible_p() for Sparse.

https://lore.kernel.org/patchwork/patch/1013734/





-- 
Best Regards
Masahiro Yamada