linux-kernel - Re: [PATCH 6/6] x86/gsseg: use the LKGS instruction if available for load_gs

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Message-ID: <Y0A9PNIYkjdNjGrg@hirez.programming.kicks-ass.net>
Date:   Fri, 7 Oct 2022 16:52:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Xin Li <xin3.li@...el.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com
Subject: Re: [PATCH 6/6] x86/gsseg: use the LKGS instruction if available for
 load_gs_index()

On Thu, Oct 06, 2022 at 08:40:41AM -0700, Xin Li wrote:

> +#define LKGS_DI	_ASM_BYTES(0xf2,0x0f,0x00,0xf7)

This should come with a comment that states the binutils version that
understands: "lkgs %di" (or however that ends being).