linux-kernel - Re: [PATCH 03/11] x86/mm: get INVLPGB count max from CPUID

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Message-Id: <879D0856-4807-4FB8-85D9-2E5C42C72659@gmail.com>
Date: Thu, 26 Dec 2024 01:42:58 +0200
From: Nadav Amit <nadav.amit@...il.com>
To: Rik van Riel <riel@...riel.com>
Cc: the arch/x86 maintainers <x86@...nel.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 kernel-team@...a.com,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 luto@...nel.org,
 peterz@...radead.org,
 Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>,
 "H. Peter Anvin" <hpa@...or.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>
Subject: Re: [PATCH 03/11] x86/mm: get INVLPGB count max from CPUID

> On 23 Dec 2024, at 4:55, Rik van Riel <riel@...riel.com> wrote:
> 
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -138,6 +138,10 @@ __visible unsigned long mmu_cr4_features __ro_after_init;
> __visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
> #endif
> 
> +#ifdef CONFIG_CPU_SUP_AMD
> +u16 invlpgb_count_max;

Any reason to mark it also as __ro_after_init?