linux-kernel - Re: [PATCH 2/2] Kconfig: CC_HAS_NO_PROFILE_FN

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Date:   Tue, 22 Jun 2021 10:32:42 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Bill Wendling <morbo@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Bill Wendling <wcw@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        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>,
        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 <johannes.berg@...el.com>,
        linux-toolchains@...r.kernel.org, Marco Elver <elver@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-s390 <linux-s390@...r.kernel.org>
Subject: Re: [PATCH 2/2] Kconfig: CC_HAS_NO_PROFILE_FN_ATTR, depend on for
 GCOV and PGO

On Tue, Jun 22, 2021 at 10:29:37AM +0100, Mark Rutland wrote:
> On Tue, Jun 22, 2021 at 10:25:34AM +0100, Catalin Marinas wrote:
> > On Mon, Jun 21, 2021 at 01:43:54PM -0700, Nick Desaulniers wrote:
> > > We need to be able to express via Kconfig "GCOV should not be enabled
> > > for architectures that use noinstr when the toolchain does not support
> > > __attribute__((no_profile_instrument_function))."
> > > 
> > > Where "architectures that use noinstr" are currently arm64, s390, and
> > > x86.  So I guess we could do:
> > > 
> > > + depends on !ARM64 || !S390 || !X86 || CC_HAS_NO_PROFILE_FN_ATTR
> > 
> > I think you want:
> > 
> >   depends on !(ARM64 || S390 || X86) || CC_HAS_NO_PROFILE_FN_ATTR
> > 
> > > (We could add a Kconfig for ARCH_WANTS_NO_INSTR, which might be more
> > > informative than listed out architectures which might be non-obvious
> > > to passers-by).
> > 
> > That would probably look better.
> 
> It does; see:
> 
> https://lore.kernel.org/r/20210621231822.2848305-1-ndesaulniers@google.com

I'm getting there, eventually ;).

-- 
Catalin