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

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Message-ID: <7ff32a10-1950-434b-8820-bb7c3b408544@intel.com>
Date: Thu, 7 Nov 2024 15:36:44 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Sohil Mehta <sohil.mehta@...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>,
 "H . Peter Anvin" <hpa@...or.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 11/7/24 15:30, Sohil Mehta wrote:
> Linux defined feature bits X86_FEATURE_P3 and X86_FEATURE_P4 are not
> used anywhere, neither are they visible to userspace.
> commit f31d731e4467 ("x86: use X86_FEATURE_NOPL in alternatives") got
> rid of the last usage. Remove the related mappings and code.

Hah, not referenced since 2008!  This one seems like a no-brainer.
Thanks for finding it!

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