From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Eli Friedman <efriedma@codeaurora.org>,
Christopher Li <sparse@chrisli.org>,
Kees Cook <keescook@chromium.org>, Ingo Molnar <mingo@kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Joe Perches <joe@perches.com>,
Dominique Martinet <asmadeus@codewreck.org>,
Nick Desaulniers <ndesaulniers@google.com>
Subject: Re: [PATCH 4/7] Compiler Attributes: homogenize __must_be_array
Date: Sat, 1 Sep 2018 11:17:40 +0200 [thread overview]
Message-ID: <20180901091738.73dzegdenvla5crf@ltop.local> (raw)
In-Reply-To: <20180831170514.24665-4-miguel.ojeda.sandonis@gmail.com>
On Fri, Aug 31, 2018 at 07:05:11PM +0200, Miguel Ojeda wrote:
> Different definitions of __must_be_array:
>
> * gcc: disabled for __CHECKER__
> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
> index e0e55eb3f242..e4a702f99e50 100644
> --- a/include/linux/compiler.h
> +++ b/include/linux/compiler.h
> @@ -357,4 +357,11 @@ static inline void *offset_to_ptr(const int *off)
> compiletime_assert(__native_word(t), \
> "Need native word sized stores/loads for atomicity.")
>
> +#ifdef __CHECKER__
> +#define __must_be_array(a) 0
> +#else
> +/* &a[0] degrades to a pointer: a different type from an array */
> +#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
> +#endif
> +
> #endif /* __LINUX_COMPILER_H */
You can also remove the #ifdef __CHECKER__ because:
1) even ancient version of sparse don't have a problem
2) BUILD_BUG_ON_ZERO() is currently disabled for __CHECKER__
-- Luc Van Oostenryck
next prev parent reply other threads:[~2018-09-01 9:18 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-31 17:05 [PATCH 1/7] Compiler Attributes: remove unused attributes Miguel Ojeda
2018-08-31 17:05 ` [PATCH 2/7] Compiler Attributes: use the no-underscores syntax Miguel Ojeda
2018-08-31 18:51 ` Nick Desaulniers
2018-08-31 19:17 ` Miguel Ojeda
2018-08-31 21:49 ` Rasmus Villemoes
2018-08-31 22:10 ` Miguel Ojeda
2018-08-31 22:40 ` Miguel Ojeda
2018-09-03 6:42 ` Geert Uytterhoeven
2018-09-03 10:40 ` Miguel Ojeda
2018-08-31 17:05 ` [PATCH 3/7] Compiler Attributes: remove unneeded tests Miguel Ojeda
2018-08-31 21:10 ` Nick Desaulniers
2018-09-01 8:16 ` kbuild test robot
2018-09-01 9:56 ` kbuild test robot
2018-08-31 17:05 ` [PATCH 4/7] Compiler Attributes: homogenize __must_be_array Miguel Ojeda
2018-08-31 21:16 ` Nick Desaulniers
2018-09-01 9:17 ` Luc Van Oostenryck [this message]
2018-09-01 12:11 ` Miguel Ojeda
2018-08-31 17:05 ` [PATCH 5/7] Compiler Attributes: naked was fixed in gcc 4.6 Miguel Ojeda
2018-08-31 19:48 ` Arnd Bergmann
2018-08-31 20:26 ` Miguel Ojeda
2018-08-31 17:05 ` [PATCH 6/7] Compiler Attributes: remove unneeded sparse (__CHECKER__) tests Miguel Ojeda
2018-08-31 21:38 ` Nick Desaulniers
2018-08-31 21:55 ` Miguel Ojeda
2018-08-31 22:39 ` Luc Van Oostenryck
2018-08-31 17:05 ` [PATCH 7/7] Compiler Attributes: use feature checks instead of version checks Miguel Ojeda
2018-08-31 23:07 ` Nick Desaulniers
2018-09-01 13:38 ` Miguel Ojeda
2018-09-01 18:39 ` Greg KH
2018-09-01 19:15 ` Miguel Ojeda
2018-09-01 9:24 ` kbuild test robot
2018-09-01 9:51 ` kbuild test robot
2018-09-01 9:56 ` Luc Van Oostenryck
2018-09-01 12:58 ` Miguel Ojeda
2018-09-01 10:14 ` Dominique Martinet
2018-09-01 12:55 ` Miguel Ojeda
2018-09-01 14:17 ` Dominique Martinet
2018-09-03 18:03 ` Miguel Ojeda
2018-08-31 17:27 ` [PATCH 1/7] Compiler Attributes: remove unused attributes Joe Perches
2018-08-31 18:43 ` Nick Desaulniers
2018-08-31 18:53 ` Joe Perches
2018-08-31 20:23 ` Miguel Ojeda
2018-08-31 21:27 ` Nick Desaulniers
2018-09-02 19:54 ` Arnd Bergmann
2018-09-03 11:16 ` Miguel Ojeda
2018-08-31 18:39 ` Nick Desaulniers
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