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Date:   Wed, 23 Dec 2020 15:15:25 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Marco Elver <elver@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "kbuild: avoid static_assert for genksyms"

On Sun, Dec 20, 2020 at 3:40 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> This reverts commit 14dc3983b5dff513a90bd5a8cc90acaf7867c3d0.
>
> Macro Elver had sent a fix proper fix earlier, and also pointed out
> corner cases:
>
> "I guess what you propose is simpler, but might still have corner cases
> where we still get warnings. In particular, if some file (for whatever
> reason) does not include build_bug.h and uses a raw _Static_assert(),
> then we still get warnings. E.g. I see 1 user of raw _Static_assert()
> (drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h )."
>
> I believe the raw use of _Static_assert() should be allowed, so this
> should be fixed in genksyms.
>
> Even after commit 14dc3983b5df ("kbuild: avoid static_assert for
> genksyms"), I confirmed the following test code emits the warning.
>
>   ---------------->8----------------
>   #include <linux/export.h>
>
>   _Static_assert((1 ?: 0), "");
>
>   void foo(void) { }
>   EXPORT_SYMBOL(foo);
>   ---------------->8----------------
>
>   WARNING: modpost: EXPORT symbol "foo" [vmlinux] version generation failed, symbol will not be versioned.
>
> Now that commit 869b91992bce ("genksyms: Ignore module scoped

I updated the commit id in the mainline.

     9ab55d7f240f


Now, applied to linux-kbuild.



> _Static_assert()") fixed this issue properly, the workaround should
> be reverted.
>
> Link: https://lkml.org/lkml/2020/12/10/845
> Cc: Marco Elver <elver@...gle.com>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>
> I will apply this after Macro's patch is pulled.
>
>
>
>  include/linux/build_bug.h | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/include/linux/build_bug.h b/include/linux/build_bug.h
> index 7bb66e15b481..e3a0be2c90ad 100644
> --- a/include/linux/build_bug.h
> +++ b/include/linux/build_bug.h
> @@ -77,9 +77,4 @@
>  #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
>  #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
>
> -#ifdef __GENKSYMS__
> -/* genksyms gets confused by _Static_assert */
> -#define _Static_assert(expr, ...)
> -#endif
> -
>  #endif /* _LINUX_BUILD_BUG_H */
> --
> 2.27.0
>


-- 
Best Regards
Masahiro Yamada

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