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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eb6ccd211sm14335557f8f.10.2026.05.23.03.02.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 May 2026 03:02:17 -0700 (PDT) Date: Sat, 23 May 2026 11:02:16 +0100 From: David Laight To: "Arnd Bergmann" Cc: "Arnd Bergmann" , "Ingo Molnar" , "Richard Weinberger" , "Anton Ivanov" , "Johannes Berg" , "Thomas Gleixner" , "Borislav Petkov" , "Dave Hansen" , "H. Peter Anvin" , "Peter Zijlstra" , "Will Deacon" , "Boqun Feng" , "Gary Guo" , "Yury Norov" , "Rasmus Villemoes" , "Boris Ostrovsky" , "Alexander Usyskin" , "Anthony L Nguyen" , "Przemek Kitszel" , x86@kernel.org, linux-kernel@vger.kernel.org, linux-um@lists.infradead.org Subject: Re: [PATCH 8/8] x86: simplify 32-bit instruction set selection Message-ID: <20260523110216.2724bf6b@pumpkin> In-Reply-To: <9789e44c-cad6-4fb9-b684-ed132347a92d@app.fastmail.com> References: <20260522141959.1071595-1-arnd@kernel.org> <20260522141959.1071595-9-arnd@kernel.org> <20260522223349.155dfe20@pumpkin> <9789e44c-cad6-4fb9-b684-ed132347a92d@app.fastmail.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260523_030220_605945_8FAEB69F X-CRM114-Status: GOOD ( 13.56 ) X-BeenThere: linux-um@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-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On Sat, 23 May 2026 10:51:41 +0200 "Arnd Bergmann" wrote: > On Fri, May 22, 2026, at 23:33, David Laight wrote: ... > > But neither is really anything like even Sandy bridge. > > Sandy Bridge was well into the 64-bit era. Even when that was > new, you wouldn't have run a 32-bit kernel on it (or cared > about CPU optimizations if you did). For x86-64 there is no > CPU selection and we just always build with -mtune=generic. > This works well with any out-of-order microarchitecture. For some reason I was thinking the same mtune list would apply to 64bit (even though some would clearly be pointless). I probably got fooled by you saying that the other ten are aliases. -- David > > Arnd