linux-kernel - Re: [PATCH v8 1/7] arm64: Add HAVE_REGS_AND_STACK_ACCESS

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Message-ID: <20150818093817.GE10301@arm.com>
Date:	Tue, 18 Aug 2015 10:38:18 +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 1/7] arm64: Add HAVE_REGS_AND_STACK_ACCESS_API feature

Hi David,

On Thu, Aug 13, 2015 at 04:50:40AM +0100, David Long wrote:
> On 08/11/15 13:31, Will Deacon wrote:
> > On Tue, Aug 11, 2015 at 01:52:38AM +0100, David Long wrote:
> >> +	REG_OFFSET_NAME(x30),
> >
> > Does this interact badly with perf tools, which expect to pass "lr" for
> > x30? (see tools/perf/arch/arm64/include/perf_regs.h).
> >
> 
> Possibly, I can test that when I'm back from my short vacation this 
> week.  The lr/x30 thing seems to be a recurring issue.  Perhaps it is 
> best simply to add a reundant entry for x30 as "lr".  It's simple enough 
> to do, although just slightly ugly looking as it would have to be done 
> without a macro.  Would one ever use "x31" in place of "sp"?

No; "sp" should always be "sp". Let me know how you get on with perf. I
couldn't quite tie the two ends together, but it does look like it expects
"lr" to work.

Will
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