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

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Date:   Tue, 15 Sep 2020 13:35:39 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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>
Subject: Re: [PATCH 5.8 108/177] gcov: Disable gcov build with GCC 10

On Tue, Sep 15, 2020 at 10:24:25AM -0700, Linus Torvalds wrote:
>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.

AUTOSEL spotted it
(https://lore.kernel.org/stable/20200914130358.1804194-27-sashal@kernel.org/),
and I didn't want to rush it in given it doesn't have a fixes/stable
tag.

I'll queue it up for this cycle as you've pointed it out.

-- 
Thanks,
Sasha