linux-kernel - Re: [PATCH -rc 0/4] Protect from GCC garbage input in GCOV

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Date:   Wed, 2 Sep 2020 20:52:41 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Colin Ian King <colin.king@...onical.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -rc 0/4] Protect from GCC garbage input in GCOV

On Wed, Sep 02, 2020 at 10:42:55AM -0700, Linus Torvalds wrote:
> On Wed, Sep 2, 2020 at 1:55 AM Leon Romanovsky <leon@...nel.org> wrote:
> >
> > Bottom line, GCOV is broken on GCC 10.2.
>
> The patches don't really make sense to me.
>
> How about we just disable GCOV with the known-broken compiler version
> instead? As mentioned in the replies to individual patches, it looks
> like the "fixes" are random bandaids that don't _really_ fix anything.

Right, as I wrote in RFC "solution is wrong", I knew it, just didn't
get any feedback on how to do it correctly.

Are you suggesting something like this?

diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
index 3110c77230c7..bc0e355f64aa 100644
--- a/kernel/gcov/Kconfig
+++ b/kernel/gcov/Kconfig
@@ -3,7 +3,7 @@ menu "GCOV-based kernel profiling"

 config GCOV_KERNEL
        bool "Enable gcov-based kernel profiling"
-       depends on DEBUG_FS
+       depends on DEBUG_FS && (GCC_VERSION >= XXX && GCC_VERSION < YYY)
        select CONSTRUCTORS if !UML
        default n
        help
~


Thanks

>
>                 Linus