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Message-ID: <SJ1PR11MB6083EC9DE16B472CBF10E484FC78A@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Tue, 24 Jun 2025 00:10:50 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: "H. Peter Anvin" <hpa@...or.com>, "Hansen, Dave" <dave.hansen@...el.com>,
	"Mehta, Sohil" <sohil.mehta@...el.com>, "Kirill A. Shutemov"
	<kirill.shutemov@...ux.intel.com>, Dave Hansen <dave.hansen@...ux.intel.com>
CC: Jonathan Corbet <corbet@....net>, Ingo Molnar <mingo@...nel.org>, "Pawan
 Gupta" <pawan.kumar.gupta@...ux.intel.com>, Daniel Sneddon
	<daniel.sneddon@...ux.intel.com>, "Huang, Kai" <kai.huang@...el.com>,
	Sandipan Das <sandipan.das@....com>, Breno Leitao <leitao@...ian.org>,
	"Edgecombe, Rick P" <rick.p.edgecombe@...el.com>, Alexei Starovoitov
	<ast@...nel.org>, Hou Tao <houtao1@...wei.com>, Juergen Gross
	<jgross@...e.com>, Vegard Nossum <vegard.nossum@...cle.com>, Kees Cook
	<kees@...nel.org>, Eric Biggers <ebiggers@...gle.com>, Jason Gunthorpe
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 Morton" <akpm@...ux-foundation.org>, Luis Chamberlain <mcgrof@...nel.org>,
	Yuntao Wang <ytcoode@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>,
	Christophe Leroy <christophe.leroy@...roup.eu>, Tejun Heo <tj@...nel.org>,
	Changbin Du <changbin.du@...wei.com>, Huang Shijie
	<shijie@...amperecomputing.com>, Geert Uytterhoeven
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 Carvalho de Melo" <acme@...hat.com>, "linux-doc@...r.kernel.org"
	<linux-doc@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-efi@...r.kernel.org"
	<linux-efi@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "Yian
 Chen" <yian.chen@...el.com>, Andy Lutomirski <luto@...nel.org>, "Thomas
 Gleixner" <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "Borislav
 Petkov" <bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>, Peter Zijlstra
	<peterz@...radead.org>, Ard Biesheuvel <ardb@...nel.org>, "Paul E. McKenney"
	<paulmck@...nel.org>, Josh Poimboeuf <jpoimboe@...nel.org>, Xiongwei Song
	<xiongwei.song@...driver.com>, "Li, Xin3" <xin3.li@...el.com>, "Mike Rapoport
 (IBM)" <rppt@...nel.org>, Brijesh Singh <brijesh.singh@....com>, Michael Roth
	<michael.roth@....com>, Alexey Kardashevskiy <aik@....com>, "Alexander
 Shishkin" <alexander.shishkin@...ux.intel.com>
Subject: RE: [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits

> 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.

Do we actually do that? Probably not.

-Tony

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