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Tue, 11 Nov 2025 07:42:15 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: AMQSEuwlfej7 Date: Tue, 11 Nov 2025 13:41:23 +0100 From: "Arnd Bergmann" To: "Heiko Carstens" , "Alexander Gordeev" , "Vasily Gorbik" , "Christian Borntraeger" , "Sven Schnelle" , "Andreas Krebbel" , "Linus Torvalds" Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Message-Id: <34f6144b-600e-42f3-88f5-3e712a328986@app.fastmail.com> In-Reply-To: <20251110185440.2667511-1-hca@linux.ibm.com> References: <20251110185440.2667511-1-hca@linux.ibm.com> Subject: Re: [RFC PATCH 0/8] s390: Remove compat support Content-Type: text/plain Content-Transfer-Encoding: 7bit On Mon, Nov 10, 2025, at 19:54, Heiko Carstens wrote: > Remove s390 compat support to allow for code simplification and especially > reduced test effort. To the best of our knowledge there aren't any 31 bit > binaries out in the world anymore that would matter for newer kernels or > newer distributions. > > Distributions do not provide compat packages since quite some time or even > have CONFIG_COMPAT disabled. > > Instead of adding deprecation warnings to config option, or adding kernel > messages, just remove the code. Deprecation warnings haven't proven to be > useful. If it turns out there is still a reason to keep the compat support > this series can be reverted at any time in the future. > > Arnd, we talked about this two weeks ago. I would appreciate if you could > have a look at this series, especially the last patch of this series. > > Patches 1-3 are just some random cleanups / preparations. > Patches 4-6 remove compat support. > Patches 7-8 switch s390 to generic system call table generation Loooks good to me overall, Reviewed-by: Arnd Bergmann I agree it's rather unlikely that anyone is still using 31-bit binaries, it was only really from 2000 to 2002 that commercial distros were missing s390x support. Debian moved to 64-bit-only much later than the others, but had both fewer user and fewer third-party applications that might require old binaries. Arnd