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

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Message-ID: <20170224094644.ify3fpzw33o754ra@pd.tnic>
Date:   Fri, 24 Feb 2017 10:46:44 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     hpa@...or.com, 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 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 :)

-- 
Regards/Gruss,
    Boris.

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