linux-kernel - Re: linux-next build error (9)

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Date:   Tue, 23 Jun 2020 13:24:48 +0200
From:   Marco Elver <elver@...gle.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     syzbot <syzbot+dbf8cf3717c8ef4a90a0@...kaller.appspotmail.com>,
        bp@...en8.de, hpa@...or.com, jmattson@...gle.com, joro@...tes.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-next@...r.kernel.org, mingo@...hat.com, pbonzini@...hat.com,
        sean.j.christopherson@...el.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, vkuznets@...hat.com, wanpengli@...cent.com,
        x86@...nel.org
Subject: Re: linux-next build error (9)

On Tue, Jun 23, 2020 at 08:17PM +1000, Stephen Rothwell wrote:
> Hi Peter,
> 
> On Tue, 23 Jun 2020 11:32:30 +0200 Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > I suppose the next quest is finding a s390 compiler version that works
> > and then bumping the version test in the aforementioned commit.
> 
> Not a lot of help, but my Debian cross compiler seems to work:
> 
> $ s390x-linux-gnu-gcc --version
> s390x-linux-gnu-gcc (Debian 9.3.0-13) 9.3.0

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.

Suggested patch below.

Thanks,
-- Marco

------ >8 ------

From: Marco Elver <elver@...gle.com>
Date: Tue, 23 Jun 2020 12:57:42 +0200
Subject: [PATCH] kasan: Fix required compiler version

The first working GCC version to satisfy
CC_HAS_WORKING_NOSANITIZE_ADDRESS is GCC 8.3.0.

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89124
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Marco Elver <elver@...gle.com>
---
 lib/Kconfig.kasan | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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=kernel-hwaddress)
 
 config CC_HAS_WORKING_NOSANITIZE_ADDRESS
-	def_bool !CC_IS_GCC || GCC_VERSION >= 80000
+	def_bool !CC_IS_GCC || GCC_VERSION >= 80300
 
 config KASAN
 	bool "KASAN: runtime memory debugger"
-- 
2.27.0.111.gc72c7da667-goog