From: Heiko Carstens <hca@linux.ibm.com>
To: Nathan Chancellor <nathan@kernel.org>
Cc: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>,
Juergen Christ <jchrist@linux.ibm.com>,
Ilya Leoshkevich <iii@linux.ibm.com>,
Dominik Steenken <dost@de.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Maxim Khmelevskii <max@linux.ibm.com>,
Jens Remus <jremus@linux.ibm.com>,
Sami Tolvanen <samitolvanen@google.com>,
Kees Cook <kees@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>,
llvm@lists.linux.dev, bpf@vger.kernel.org,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/6] s390/Kconfig: Select ARCH_SUPPORTS_CFI
Date: Mon, 27 Jul 2026 15:52:29 +0200 [thread overview]
Message-ID: <20260727135229.11274A39-hca@linux.ibm.com> (raw)
In-Reply-To: <20260725010004.GA1686739@ax162>
On Fri, Jul 24, 2026 at 06:00:04PM -0700, Nathan Chancellor wrote:
> Hi Heiko,
>
> On Fri, Jul 24, 2026 at 04:13:17PM +0200, Heiko Carstens wrote:
> > With all prerequisites in place select ARCH_SUPPORTS_CFI.
> >
> > Note that this support is supposed to work with the generic kcfi support
> > which is provided by clang. This comes with a couple of limitations:
>
> Consider adding
>
> select ARCH_USES_CFI_GENERIC_LLVM_PASS if CC_IS_CLANG
>
> to this change in case there are problems such as the one worked around
> by commit c57f5fee54df ("libeth: xdp: Disable generic kCFI pass for
> libeth_xdp_tx_xmit_bulk()"). Whenever clang grows an s390 backend
> expansion for kCFI, that can be version gated pretty easily.
Thanks, I'll add that.
> I will test this series fully next week.
Highly appreciated!
I'm going to send a v2 soon, which addresses your feedback, and
hopefully all AI findings too.
next prev parent reply other threads:[~2026-07-27 14:17 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-24 14:13 [PATCH 0/6] s390: Add kCFI support Heiko Carstens
2026-07-24 14:13 ` [PATCH 1/6] s390/tools: Pass symbol name to do_relocs() Heiko Carstens
2026-07-24 14:23 ` sashiko-bot
2026-07-24 15:14 ` bot+bpf-ci
2026-07-24 14:13 ` [PATCH 2/6] s390/tools/relocs: Ignore __kcfi_typeid_ relocations Heiko Carstens
2026-07-24 14:30 ` sashiko-bot
2026-07-24 14:13 ` [PATCH 3/6] s390: Add ftrace_stub_graph Heiko Carstens
2026-07-24 14:21 ` sashiko-bot
2026-07-24 15:14 ` bot+bpf-ci
2026-07-24 14:13 ` [PATCH 4/6] s390/diag: Generate CFI type information for assembly functions Heiko Carstens
2026-07-24 14:26 ` sashiko-bot
2026-07-24 14:13 ` [PATCH 5/6] s390/Kconfig: Select ARCH_SUPPORTS_CFI Heiko Carstens
2026-07-24 14:37 ` sashiko-bot
2026-07-25 1:00 ` Nathan Chancellor
2026-07-27 13:52 ` Heiko Carstens [this message]
2026-07-24 14:13 ` [PATCH 6/6] s390/bpf: Add kCFI support Heiko Carstens
2026-07-24 14:34 ` sashiko-bot
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