linux-kernel - Re: [PATCH v2 05/13] uprobes: add arch write opcode hook

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Message-ID: <20131029195920.GA4538@redhat.com>
Date:	Tue, 29 Oct 2013 20:59:20 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	David Long <dave.long@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, Rabin Vincent <rabin@....in>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/13] uprobes: add arch write opcode hook

On 10/28, Oleg Nesterov wrote:
>
> Yes, yes, sorry for confusion. What I actually tried to suggest is
> something like the trivial patch below.
>
> Then arm can do:
>
> 	uprobe_opcode_t arch_uprobe_swbp_insn(struct arch_uprobe *auprobe)
> 	{
> 		return __opcode_to_mem_arm(auprobe->bpinsn);
> 	}
>
> No?
>
> > I notice there don't seem to be any alternative set_swbp functions
> > in the (rc6) kernel tree
>
> Yes... I think we should simply make it "static". And set_orig_insn()
> too.

Or. arm can actually reimplement set_swbp(). This doesn't mean the
duplication of write_opcode() code, we can simply export this helper.

Either way is imho better than this patch. Unless I missed something.

Oleg.

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