linux-kernel - Re: [PATCH] gcov,x86: Mark GCOV broken for x86

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Message-ID: <CAKwvOdkV8DLKJb7h_=6mUb_V=qdmBaCqNMU8scaBhpqF7yeeMQ@mail.gmail.com>
Date:   Mon, 14 Jun 2021 12:03:15 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Johannes Berg <johannes.berg@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Marco Elver <elver@...gle.com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] gcov,x86: Mark GCOV broken for x86

On Mon, Jun 14, 2021 at 11:21 AM Borislav Petkov <bp@...en8.de> wrote:
>
> On Mon, Jun 14, 2021 at 11:05:35AM -0700, Nick Desaulniers wrote:
> > __attribute__((no_instrument_function)) is already wired to not emit
> > calls to mcount()/fentry().  I think extending it to also apply to
> > coverage (-fprofile-arcs) and instrumentation based profiling
> > (-fprofile-generate) is reasonable.
>
> Is anyone going to ping the gcc folks so that they do it too or should
> we open a bug over there simply?

Yes, I will file a bug (or two) against GCC and then post the links on
the other thread (re: pgo) since that already has the toolchains
mailing list cc'ed.
-- 
Thanks,
~Nick Desaulniers