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Peter Anvin" To: "Luck, Tony" , "Hansen, Dave" , "Mehta, Sohil" , "Kirill A. Shutemov" , Dave Hansen CC: Jonathan Corbet , Ingo Molnar , Pawan Gupta , Daniel Sneddon , "Huang, Kai" , Sandipan Das , Breno Leitao , "Edgecombe, Rick P" , Alexei Starovoitov , Hou Tao , Juergen Gross , Vegard Nossum , Kees Cook , Eric Biggers , Jason Gunthorpe , "Masami Hiramatsu (Google)" , Andrew Morton , Luis Chamberlain , Yuntao Wang , Rasmus Villemoes , Christophe Leroy , Tejun Heo , Changbin Du , Huang Shijie , Geert Uytterhoeven , Namhyung Kim , Arnaldo Carvalho de Melo , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-efi@vger.kernel.org" , "linux-mm@kvack.org" , Yian Chen , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "x86@kernel.org" , Peter Zijlstra , Ard Biesheuvel , "Paul E. McKenney" , Josh Poimboeuf , Xiongwei Song , "Li, Xin3" , "Mike Rapoport (IBM)" , Brijesh Singh , Michael Roth , Alexey Kardashevskiy , Alexander Shishkin Subject: RE: [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits User-Agent: K-9 Mail for Android In-Reply-To: References: <20250620135325.3300848-1-kirill.shutemov@linux.intel.com> <20250620135325.3300848-2-kirill.shutemov@linux.intel.com> <248e272c-79ec-4c11-a3a8-dff1de2147c0@intel.com> <8f0913d7-9e77-41e0-91e2-17ca2454b296@intel.com> <299ED4FB-6949-4E7E-82D4-94E2E9F0A0B5@zytor.com> Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: BCFEC80004 X-Stat-Signature: jq83faeosjkmqwbijtzw5ghaoxikhrs7 X-HE-Tag: 1750730638-531277 X-HE-Meta: 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 cruh4jFX 1da4gN1gDDCzjDfX1ZpoNukdQnT/GQAk2UJjE08iHJqCYLfjlWfvhbdjRp8dJBttKU4QXFeKJbtvOrcO4Nad6v5JPm53+Zyfwk5HpYAHw+07ubtBgkR0X8dhv8bMwDorZYoRapb0TZm9bg3WhpZkuznSTIo3Z72KG6fI8s34V41Q/Z4ii+gSTj/9TM7JTey7FVONKlCESOHt4KX72ixEqy1C7LhRC1SxrmzssAzNLb4Zc45AbfvkW6UUI/8NoGfSo8GVDgcajgdG1SqyTVNb3llJosXJV2DXuZ7b6xSx6nMlvxpP7SCd0I/h0YJIexj6hchV73JjAbD25SV9LtVnRe7P4RRqJk83gH0mqfIauw9I7VoUb1HqtEcmFlhHQDtLDfBoG035O2zbyT+LkmzkhicBjyaOGlpdroz0iurFNo98pGF9LsfEh6Zd0/Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On June 23, 2025 5:10:50 PM PDT, "Luck, Tony" wro= te: >> Are we actually doing patching on more than one CPU at a time? > >We could call static_key_enable()/static_key_disable() for different >keys at the same time from multiple CPUs=2E > >Do we actually do that? Probably not=2E > >-Tony > But does it actually *work*?