linux-kernel - Re: [PATCH 2/3] x86/mm: Avoid repeated this_cpu_*() ops in switch_mm_irqs

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Message-ID: <fd29d8b6-f605-4954-83b3-71f0132cf6f2@intel.com>
Date: Fri, 23 May 2025 10:21:50 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Cc: linux-kernel@...r.kernel.org, kys@...rosoft.com, haiyangz@...rosoft.com,
 wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
 mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
 luto@...nel.org, linux-hyperv@...r.kernel.org
Subject: Re: [PATCH 2/3] x86/mm: Avoid repeated this_cpu_*() ops in
 switch_mm_irqs_off()

On 5/20/25 03:55, Peter Zijlstra wrote:
> Aside from generating slightly better code for not having to use %fs
> prefixed ops, the real purpose is to clarify code by switching some to
> smp_store_release() later on.
> 
> Notably, this_cpu_{read,write}() imply {READ,WRITE}_ONCE().

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>