linux-kernel - Re: [PATCH v2 0/3] no_profile fn attr and Kconfig for GCOV+PGO

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Date:   Tue, 22 Jun 2021 11:19:08 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     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>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        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@...r.kernel.org,
        linux-kbuild@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
        johannes.berg@...el.com, linux-toolchains@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        linux-s390@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v2 0/3] no_profile fn attr and Kconfig for GCOV+PGO

On Mon, Jun 21, 2021 at 04:18:19PM -0700, Nick Desaulniers wrote:
> Add a new function annotation __no_profile that expands to
> __attribute__((__no_profile_instrument_function__)) and Kconfig values
> CC_HAS_NO_PROFILE_FN_ATTR and ARCH_WANTS_NO_INSTR. Make GCOV and PGO
> depend on either !ARCH_WANTS_NO_INSTR or CC_HAS_NO_PROFILE_FN_ATTR.

Awesome; thanks everyone! I'm doing a Clang rebuild now, and will do
kernel testing and push this to my for-next/clang/features tree shortly.

-- 
Kees Cook