linux-kernel - Re: [PATCH 1/2] compiler_attributes.h: define __no

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Message-ID: <20210621182418.57qbumtovysrlkwy@google.com>
Date:   Mon, 21 Jun 2021 11:24:18 -0700
From:   Fangrui Song <maskray@...gle.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Bill Wendling <wcw@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Borislav Petkov <bp@...en8.de>, Martin Liska <mliska@...e.cz>,
        Marco Elver <elver@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Johannes Berg <johannes.berg@...el.com>,
        linux-toolchains@...r.kernel.org
Subject: Re: [PATCH 1/2] compiler_attributes.h: define __no_profile, add to
 noinstr

On 2021-06-21, Nick Desaulniers wrote:
>On Sat, Jun 19, 2021 at 4:32 AM Miguel Ojeda
><miguel.ojeda.sandonis@...il.com> wrote:
>>
>> On Sat, Jun 19, 2021 at 1:26 PM Miguel Ojeda
>> <miguel.ojeda.sandonis@...il.com> wrote:
>> >
>> > I am not sure if it is best or not to have the GCC link in order to be
>> > consistent with the rest of the links (they are for the docs only). Do
>> > we know if GCC going to implement it soon?
>>
>> i.e. if GCC does not implement it yet we use elsewhere this kind of
>> marker instead:
>>
>>      * Optional: not supported by gcc
>>
>> The first of its kind, normally it is clang/icc there ;-)
>
>:^) GCC does have an attribute since GCC 7.1 for this.
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80223#c11
>I'm moving Clang over to use that in
>https://reviews.llvm.org/D104658
>Once that lands, I'll send a v2 (without carrying any reviewed by tags).

Thanks! __attribute__((no_profile_instrument_function)) looks good to me.

Also a reminder that __GCC4_has_attribute___no_profile in v1 misses two
underscores. v2 no_profile_instrument_function may need to fix this.


Reviewed-by: Fangrui Song <maskray@...gle.com>

>>
>> We could nevertheless have the link there, something like:
>>
>>     * Optional: not supported by GCC
>>                 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80223
>
>-- 
>Thanks,
>~Nick Desaulniers