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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49045282201sm77281575e9.8.2026.05.22.14.33.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 May 2026 14:33:51 -0700 (PDT) Date: Fri, 22 May 2026 22:33:49 +0100 From: David Laight To: Arnd Bergmann Cc: Ingo Molnar , Arnd Bergmann , 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 , Tony 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: <20260522223349.155dfe20@pumpkin> In-Reply-To: <20260522141959.1071595-9-arnd@kernel.org> References: <20260522141959.1071595-1-arnd@kernel.org> <20260522141959.1071595-9-arnd@kernel.org> 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-20260522_143354_138494_B8623C54 X-CRM114-Status: GOOD ( 11.08 ) 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 Fri, 22 May 2026 16:19:59 +0200 Arnd Bergmann wrote: > From: Arnd Bergmann ... > Change the CPU selection to build everything with either -march=i586 > or -march=i686 and make the specific options only change the -mtune= > parameter where this was previously handled by -march=. Note that > the only -mtune= options that gcc or clang understand for x86-32 > are i486, pentium, pentiumpro, pentium4, atom, geode, k6 and athlon, > the other ten are just aliases for one of them. Hmmm... That rather implies there is nothing for anything designed in the last 20 years. No wonder code generation choices look strange at times. You don't want to pick p4, so I guess either p-pro or athlon? But neither is really anything like even Sandy bridge. -- David