linux-kernel - Re: [PATCH v3 3/3] x86/delay: Introduce TPAUSE delay

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Message-ID: <20200414103106.GK20713@hirez.programming.kicks-ass.net>
Date:   Tue, 14 Apr 2020 12:31:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kyung Min Park <kyung.min.park@...el.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, gregkh@...uxfoundation.org,
        ak@...ux.intel.com, tony.luck@...el.com, ashok.raj@...el.com,
        ravi.v.shankar@...el.com, fenghua.yu@...el.com
Subject: Re: [PATCH v3 3/3] x86/delay: Introduce TPAUSE delay

On Fri, Apr 10, 2020 at 04:29:55PM -0700, Kyung Min Park wrote:
> +static inline void __tpause(u32 ecx, u32 edx, u32 eax)
> +{
> +	/* "tpause %ecx, %edx, %eax;" */
> +	asm volatile(".byte 0x66, 0x0f, 0xae, 0xf1\t\n"
> +		     :
> +		     : "c"(ecx), "d"(edx), "a"(eax));
> +}

Can we please get a comment stating from what binutils version this
opcode has a mnemonic? That way, when we raise the minimum binutils
version we can easily grep and find such things.