linux-kernel - Re: [PATCH v7 3.2-rc2 8/30] x86: analyze instruction and determine fixups.

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Message-ID: <20111130185751.GA8160@redhat.com>
Date:	Wed, 30 Nov 2011 19:57:51 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Anton Arapov <anton@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Stephen Wilson <wilsons@...rt.ca>
Subject: Re: [PATCH v7 3.2-rc2 8/30] x86: analyze instruction and determine
	fixups.

On 11/18, Srikar Dronamraju wrote:
>
> +static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe,
> +							struct insn *insn)
> +{
> [...snip...]
> +	if (insn->immediate.nbytes) {
> +		cursor++;
> +		memmove(cursor, cursor + insn->displacement.nbytes,
> +						insn->immediate.nbytes);
> +	}
> +	return;
> +}

Of course I don not understand this code. But it seems that it can
rewrite uprobe->insn ?

If yes, don't we need to save the original insn for unregister_uprobe?

Oleg.

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