linux-kernel - Re: [RFC 8/8] ARM64: Add uprobe support

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Message-ID: <20150109174524.GA13161@redhat.com>
Date:	Fri, 9 Jan 2015 18:45:24 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Pratyush Anand <panand@...hat.com>
Cc:	Will Deacon <will.deacon@....com>,
	"tixy@...aro.org" <tixy@...aro.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	"sandeepa.prabhu@...aro.org" <sandeepa.prabhu@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"anil.s.keshavamurthy@...el.com" <anil.s.keshavamurthy@...el.com>,
	"masami.hiramatsu.pt@...achi.com" <masami.hiramatsu.pt@...achi.com>,
	"wcohen@...hat.com" <wcohen@...hat.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC 8/8] ARM64: Add uprobe support

On 01/08, Pratyush Anand wrote:
>
> On Thursday 08 January 2015 10:33 PM, Will Deacon wrote:
>>
>> I'm assuming that means you don't support compat (AArch32) tasks with this?
>
> Hummm.. Yes, compat not yet supported.
>
> I will come back on this.

I obviously do not know how difficult is to support the compat tasks, and
in any case I leave this to you and Will.

But if this is not simple, perhaps the initial implementation could simply
nack the probe in arch_uprobe_analyze_insn() if this mm is not 64-bit.
Although I do not see something like is_64bit_mm() in arch/arm64... So may be
the first version can even ignore this problem and just document the fact
that AArch32 tasks are not supported.

Oleg.

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