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Tue, 2 Apr 2024 04:19:06 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.11.0-alpha0-333-gbfea15422e-fm-20240327.001-gbfea1542 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <64d8ca78-75e8-4fe7-bc50-fde6af4e7bb2@app.fastmail.com> In-Reply-To: References: <20240401152549.131030308@linuxfoundation.org> <20240401152556.751891519@linuxfoundation.org> <44381e5a-cab6-4abb-b928-ebea7ce3d65b@app.fastmail.com> Date: Tue, 02 Apr 2024 10:17:22 +0200 From: "Arnd Bergmann" To: "Ard Biesheuvel" Cc: "Greg Kroah-Hartman" , stable@vger.kernel.org, patches@lists.linux.dev, "Linus Walleij" , "Nicolas Pitre" , "Jisheng Zhang" , "Russell King" , "Sasha Levin" Subject: Re: [PATCH 6.8 254/399] ARM: 9352/1: iwmmxt: Remove support for PJ4/PJ4B cores Content-Type: text/plain On Tue, Apr 2, 2024, at 09:30, Ard Biesheuvel wrote: > On Tue, 2 Apr 2024 at 10:19, Arnd Bergmann wrote: >> >> On Mon, Apr 1, 2024, at 17:43, Greg Kroah-Hartman wrote: >> > 6.8-stable review patch. If anyone has any objections, please let me know. >> >> I think we should not backport the feature removal, this was >> intentionally done separately from the bugfix in 303d6da167dc >> ("ARM: iwmmxt: Use undef hook to enable coprocessor for task") >> that is indeed needed in stable kernels. >> > > 303d6da167dc is not a bugfix - it moves the undef handling into C code > for PJ4 but only for ARM not Thumb. > > Subsequently, 8bcba70cb5c22 removed the Thumb exception handling, > leading to the regression. > > So without this fix, the Thumb case remains broken unless iwmmxt > support is disabled in Kconfig. > >> It still makes sense for everyone to just turn iwmmxt support >> off on pj4. >> > > If that is deemed sufficient for stable kernels, then we can drop this > backport. Otherwise, we need to do something else if this patch is not > suitable for -stable My mistake, I misremembered what you did in the end. Let's keep this one in stable then. Arnd