linux-kernel - Re: [PATCH] x86/cpufeatures: Free up unused feature bits

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Message-ID: <3732DC33-8959-494F-9A47-2ADD74C7E2DC@zytor.com>
Date: Fri, 08 Nov 2024 01:37:50 +0100
From: "H. Peter Anvin" <hpa@...or.com>
To: Sohil Mehta <sohil.mehta@...el.com>, Dave Hansen <dave.hansen@...el.com>,
        x86@...nel.org, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>
CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/cpufeatures: Free up unused feature bits

On November 8, 2024 1:35:59 AM GMT+01:00, Sohil Mehta <sohil.mehta@...el.com> wrote:
>On 11/7/2024 3:49 PM, H. Peter Anvin wrote:
>>>> -	if (c->x86 == 6)
>>>> -		set_cpu_cap(c, X86_FEATURE_P3);
>>>
>> 
>> Be careful - these bits are used in module strings and so modutils need to understand them.
>
>Sorry, I didn't understand this properly. How do I figure out whether
>these bits are used elsewhere? Can you please provide a pointer?
>
>Sohil

Look at the modutils sources.