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

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Message-ID: <20170224091537.GA18182@gmail.com>
Date:   Fri, 24 Feb 2017 10:15:37 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     hpa@...or.com
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,
        bp@...en8.de, jpoimboe@...hat.com, richard.weinberger@...il.com,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86: Implement __WARN using UD0


* hpa@...or.com <hpa@...or.com> wrote:

> Incidentally, as an alternative to a #UD, int $9 could be an alternative 
> (exception vector 9 was discontinued with the 486.)

With thousands of call sites a one byte opcode would be preferred, that's why INT3 
is so nice.

Thanks,

	Ingo