linux-kernel - Re: [PATCH] x86: Implement _

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Message-ID: <446217f9-147d-17e7-9033-845088f67806@zytor.com>
Date:   Fri, 24 Feb 2017 01:52:44 -0800
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        jpoimboe@...hat.com, richard.weinberger@...il.com,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86: Implement __WARN using UD0

On 02/24/17 01:46, Borislav Petkov wrote:
> On Fri, Feb 24, 2017 at 10:15:37AM +0100, Ingo Molnar wrote:
>> With thousands of call sites a one byte opcode would be preferred, that's why INT3 
>> is so nice.
> 
> ICEBP is also a single-byte: F1. And should be pretty unused :)
> 

That would make debugging preproduction hardware on Linux a living
nightmare.

	-hpa