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Date:   Wed, 24 Jun 2020 09:00:29 +1000
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Marco Elver <elver@google.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        syzbot <syzbot+dbf8cf3717c8ef4a90a0@syzkaller.appspotmail.com>,
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        tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com,
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Subject: Re: linux-next build error (9)
Message-ID: <20200624090029.5fa2dc1f@canb.auug.org.au>
In-Reply-To: <20200623112448.GA208112@elver.google.com>
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Hi Marco,

On Tue, 23 Jun 2020 13:24:48 +0200 Marco Elver <elver@google.com> wrote:
>
> On Tue, Jun 23, 2020 at 08:17PM +1000, Stephen Rothwell wrote:
> > Hi Peter,
> >=20
> > On Tue, 23 Jun 2020 11:32:30 +0200 Peter Zijlstra <peterz@infradead.org=
> wrote: =20
> > >
> > > I suppose the next quest is finding a s390 compiler version that works
> > > and then bumping the version test in the aforementioned commit. =20
> >=20
> > Not a lot of help, but my Debian cross compiler seems to work:
> >=20
> > $ s390x-linux-gnu-gcc --version
> > s390x-linux-gnu-gcc (Debian 9.3.0-13) 9.3.0 =20
>=20
> Rummaging through changelogs led me to 8.3.0 as the first good GCC. Also
> confirmed by building that version and compiling a file that breaks with
> older versions. It seems the first major version to fix it was 9, but
> backported to 8.3. This is for all architectures.
>=20
> Suggested patch below.
>=20
> Thanks,
> -- Marco
>=20
> ------ >8 ------ =20
>=20
> From: Marco Elver <elver@google.com>
> Date: Tue, 23 Jun 2020 12:57:42 +0200
> Subject: [PATCH] kasan: Fix required compiler version
>=20
> The first working GCC version to satisfy
> CC_HAS_WORKING_NOSANITIZE_ADDRESS is GCC 8.3.0.
>=20
> Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D89124
> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
> Signed-off-by: Marco Elver <elver@google.com>
> ---
>  lib/Kconfig.kasan | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>=20
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index 7a496b885f46..19fba15e99c6 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -16,7 +16,7 @@ config CC_HAS_KASAN_SW_TAGS
>  	def_bool $(cc-option, -fsanitize=3Dkernel-hwaddress)
> =20
>  config CC_HAS_WORKING_NOSANITIZE_ADDRESS
> -	def_bool !CC_IS_GCC || GCC_VERSION >=3D 80000
> +	def_bool !CC_IS_GCC || GCC_VERSION >=3D 80300
> =20
>  config KASAN
>  	bool "KASAN: runtime memory debugger"
> --=20
> 2.27.0.111.gc72c7da667-goog
>=20

Thanks for tracking that down.  I will add that patch to the tip tree
merge for today.

--=20
Cheers,
Stephen Rothwell

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