linux-kernel - Re: [PATCH v3 2/5] x86/enter: Create macros to set/clear IBRS

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Date:   Thu, 11 Jan 2018 17:04:21 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
cc:     Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Peter Zijlstra <peterz@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ashok Raj <ashok.raj@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] x86/enter: Create macros to set/clear IBRS

On Tue, 9 Jan 2018, Tim Chen wrote:
> +
> +.macro WRMSR_ASM msr_nr:req edx_val:req eax_val:req
> +	movl	\msr_nr, %ecx
> +	movl	\edx_val, %edx
> +	movl	\eax_val, %eax
> +.endm

This is the most brilliant piece of useless code I've seen in a long time.


	 tglx