linux-kernel - Re: [PATCH v8 0/7] arm64: Add kernel probes (kprobes) support

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Message-ID: <20150811173601.GD29880@arm.com>
Date:	Tue, 11 Aug 2015 18:36:01 +0100
From:	Will Deacon <will.deacon@....com>
To:	David Long <dave.long@...aro.org>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	"sandeepa.s.prabhu@...il.com" <sandeepa.s.prabhu@...il.com>,
	William Cohen <wcohen@...hat.com>,
	Steve Capper <steve.capper@...aro.org>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	Mark Brown <broonie@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 0/7] arm64: Add kernel probes (kprobes) support

On Tue, Aug 11, 2015 at 06:03:46PM +0100, David Long wrote:
> On 08/11/15 12:56, Will Deacon wrote:
> > On Tue, Aug 11, 2015 at 01:52:37AM +0100, David Long wrote:
> >> From: "David A. Long" <dave.long@...aro.org>
> >>
> >> This patchset is heavily based on Sandeepa Prabhu's ARM v8 kprobes patches,
> >> first seen in October 2013. This version attempts to address concerns raised by
> >> reviewers and also fixes problems discovered during testing.
> >>
> >> This patchset adds support for kernel probes(kprobes), jump probes(jprobes)
> >> and return probes(kretprobes) support for ARM64.
> >>
> >> The kprobes mechanism makes use of software breakpoint and single stepping
> >> support available in the ARM v8 kernel.
> >>
> >> This patch depends on:
> >> 	[PATCH 1/2] Move the pt_regs_offset struct definition from arch to common include file
> >> 	[PATCH 2/2] Consolidate redundant register/stack access code
> >
> > Are these two queued somewhere? This series doesn't even build without
> > them.
> 
> I posted the last revision of that on July 27.  I don't know if they're 
> "queued" somewhere.  They do affect multiple architectures so I'm not 
> certain where they would get queued. They also live in a branch in my 
> own Linaro repo.

Well they're not in linux-next, so I guess they're not currently destined
for mainline :(

> Was there a better way for me to deal with this dependency?  I was 
> reluctant to make this into one patch set as the other patch really does 
> stand alone as a useful fix.

I agree (well, it's a cleanup not a fix). Perhaps it's worth reposting
them with akpm also on Cc, as he sometimes picks up tree-wide patches
like that.

Will
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