linux-kernel - Re: [PATCH 0/2] no_profile fn attr and Kconfig for GCOV+PGO

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Date:   Sun, 20 Jun 2021 01:08:58 -0700
From:   Bill Wendling <morbo@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        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>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        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>,
        LKML <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>,
        Fangrui Song <maskray@...gle.com>,
        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@...el.com,
        linux-toolchains@...r.kernel.org
Subject: Re: [PATCH 0/2] no_profile fn attr and Kconfig for GCOV+PGO

On Fri, Jun 18, 2021 at 7:45 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Fri, Jun 18, 2021 at 04:30:21PM -0700, Nick Desaulniers wrote:
> > When we say noinstr, we mean noinstr.  GCOV and PGO can both instrument
> > functions. Add a new function annotation __no_profile that expands to
> > __attribute__((__no_profile__)) and Kconfig value
> > CC_HAS_NO_PROFILE_FN_ATTR.
> >
> > Base is
> > https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/log/?h=for-next/clang/pgo.
> >
> > Nick Desaulniers (2):
> >   compiler_attributes.h: define __no_profile, add to noinstr
> >   Kconfig: CC_HAS_NO_PROFILE_FN_ATTR, depend on for GCOV and PGO
>
> Oh, awesome! Thanks for the fast work on this. If there are no objections,
> I'll apply this in front of the PGO series and put it in -next.
>
That works for me! Thanks, Nick and Kees!

-bw