linux-kernel - Re: [PATCH v4 3.0-rc2-tip 5/22] 5: x86: analyze instruction and determine fixups.

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Date:	Fri, 10 Jun 2011 01:03:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 5/22]  5: x86: analyze instruction and
 determine fixups.

On Tue, 2011-06-07 at 18:29 +0530, Srikar Dronamraju wrote:
> +static void report_bad_prefix(void)
> +{
> +       pr_warn_once("uprobes does not currently support probing "
> +               "instructions with any of the following prefixes: "
> +               "cs:, ds:, es:, ss:, lock:\n");
> +}
> +
> +static void report_bad_1byte_opcode(int mode, uprobe_opcode_t op)
> +{
> +       pr_warn_once("In %d-bit apps, "
> +               "uprobes does not currently support probing "
> +               "instructions whose first byte is 0x%2.2x\n", mode, op);
> +}
> +
> +static void report_bad_2byte_opcode(uprobe_opcode_t op)
> +{
> +       pr_warn_once("uprobes does not currently support probing "
> +               "instructions with the 2-byte opcode 0x0f 0x%2.2x\n", op);
> +} 

I really don't like all that dmesg muck, why not simply fail the op?

This _once stuff is pretty useless too, once you've had them all
subsequent probe attempts will not say anything and leave you in the
dark anyway.



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