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[77.7.86.196]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4957f99fa7asm11730455e9.2.2026.07.24.00.50.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Jul 2026 00:50:47 -0700 (PDT) Date: Fri, 24 Jul 2026 09:50:16 +0200 From: Karl Mehltretter To: Arnd Bergmann Cc: linux-arm-kernel@lists.infradead.org, Russell King , Kevin Cernekee , Gregory Fong Subject: Re: [PATCH] ARM: set MAX_PHYSMEM_BITS to 32 for !LPAE Message-ID: References: <20260724063048.12565-1-kmehltretter@gmail.com> <3c79d2dc-8fbd-40fc-8b2d-9d1b4f8ed34e@app.fastmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3c79d2dc-8fbd-40fc-8b2d-9d1b4f8ed34e@app.fastmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260724_005050_805197_24295771 X-CRM114-Status: GOOD ( 15.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jul 24, 2026 at 09:23:45AM +0100, Arnd Bergmann wrote: > When we added the 36 bit limit, that was specifically to account > for CONFIG_IO_36 on XSC3 cores, see commit 23bdf86aa06e ("[ARM] > 3377/2: add support for intel xsc3 core") and the thread around > > https://lore.kernel.org/all/CAK8P3a2MCdUbN0QSb+M3g5_6HjPsaQwtKxFjADMZWomdry4-Ww@mail.gmail.com/ > > It's probably safe to assume that none of this is used in > practice, as only PXA3xx has this CPU core now that IXP23xx and IOP > are gone, and PXA does not use the high addressing. Similarly, we > never had any platform attempt to use IO_36 on ARMv6 or ARMv7-A. > > Can you update the patch to also remove CONFIG_IO_36 and explain > the dependency? Hi Arnd, Good catch, I wasn't aware of that history. I'll do that. Thanks, Karl