linux-kernel - Re: [PATCH 5.8 108/177] gcov: Disable gcov build with GCC 10

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Message-ID: <CAHk-=wiBNqZm2E89SiTmtSPQr+pbdswwdPY6oH_wF1rvAeJnAQ@mail.gmail.com>
Date:   Tue, 15 Sep 2020 10:24:25 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Colin Ian King <colin.king@...onical.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.8 108/177] gcov: Disable gcov build with GCC 10

On Tue, Sep 15, 2020 at 7:28 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> GCOV built with GCC 10 doesn't initialize n_function variable.  This
> produces different kernel panics as was seen by Colin in Ubuntu and me
> in FC 32.
>
> As a workaround, let's disable GCOV build for broken GCC 10 version.

Oh, Peter Oberparleiter actually figured out what was wrong, and we
have commit 40249c696207 ("gcov: add support for GCC 10.1") upstream
that enables it again with the fix for the changed semantics in
gcc-10.

                          Linus