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List: linux-sparse
Subject: Re: [PATCH v3 1/2] Compiler Attributes: naked can be shared
From: Matthias Kaehlcke <mka () chromium ! org>
Date: 2018-09-25 19:03:49
Message-ID: 20180925190349.GB22824 () google ! com
[Download RAW message or body]
Sorry, this series got messed up. Apparently the branch was still
rebasing when I ran 'git send-email' :/
On Tue, Sep 25, 2018 at 11:53:38AM -0700, Matthias Kaehlcke wrote:
> From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
>
> The naked attribute is supported by at least gcc >= 4.6 (for ARM,
> which is the only current user), gcc >= 8 (for x86), clang >= 3.1
> and icc >= 13. See https://godbolt.org/z/350Dyc
>
> Therefore, move it out of compiler-gcc.h so that the definition
> is shared by all compilers.
>
> This also fixes Clang support for ARM32 --- 815f0ddb346c
> ("include/linux/compiler*.h: make compiler-*.h mutually exclusive").
>
> Fixes: 815f0ddb346c ("include/linux/compiler*.h: make compiler-*.h mutually exclusive")
> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> Cc: Eli Friedman <efriedma@codeaurora.org>
> Cc: Christopher Li <sparse@chrisli.org>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> Cc: Joe Perches <joe@perches.com>
> Cc: Dominique Martinet <asmadeus@codewreck.org>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: linux-sparse@vger.kernel.org
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Tested-by: Stefan Agner <stefan@agner.ch>
> Reviewed-by: Stefan Agner <stefan@agner.ch>
> Reviewed-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
> include/linux/compiler-gcc.h | 8 --------
> include/linux/compiler_types.h | 8 ++++++++
> 2 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
> index 25d3dd6b2702..4d36b27214fd 100644
> --- a/include/linux/compiler-gcc.h
> +++ b/include/linux/compiler-gcc.h
> @@ -79,14 +79,6 @@
> #define __noretpoline __attribute__((indirect_branch("keep")))
> #endif
>
> -/*
> - * it doesn't make sense on ARM (currently the only user of __naked)
> - * to trace naked functions because then mcount is called without
> - * stack and frame pointer being set up and there is no chance to
> - * restore the lr register to the value before mcount was called.
> - */
> -#define __naked __attribute__((naked)) notrace
> -
> #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
>
> #define __optimize(level) __attribute__((__optimize__(level)))
> diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
> index 3525c179698c..db192becfec4 100644
> --- a/include/linux/compiler_types.h
> +++ b/include/linux/compiler_types.h
> @@ -226,6 +226,14 @@ struct ftrace_likely_data {
> #define notrace __attribute__((no_instrument_function))
> #endif
>
> +/*
> + * it doesn't make sense on ARM (currently the only user of __naked)
> + * to trace naked functions because then mcount is called without
> + * stack and frame pointer being set up and there is no chance to
> + * restore the lr register to the value before mcount was called.
> + */
> +#define __naked __attribute__((naked)) notrace
> +
> #define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
>
> /*
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