linux-kernel - Re: [PATCH 19/19] [INCOMPLETE] ARM: make return_address available for ARM

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Date:	Tue, 7 Jan 2014 14:41:30 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	sahara <keun-o.park@...driver.com>,
	Keun-O Park <kpark3469@...il.com>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Dave Martin <Dave.Martin@....com>
Subject: Re: [PATCH 19/19] [INCOMPLETE] ARM: make return_address available
	for ARM_UNWIND

On Tue, Jan 07, 2014 at 03:33:34PM +0100, Arnd Bergmann wrote:
> On Tuesday 29 January 2013, Keun-O Park wrote:
> > On Mon, Jan 28, 2013 at 9:50 PM, Dave Martin <dave.martin@...aro.org> wrote:
> > > On Mon, Jan 28, 2013 at 11:33:11AM +0900, Keun-O Park wrote:
> > >> Hello guys,
> > >>
> > >> Could you please review the patch of fixing bug first of returning
> > >> wrong address when using frame pointer?
> > >> I am wondering if the first patch is not delivered to the mailing.
> > >
> > > I posted a similar patch to alkml a couple of months ago, but I got
> > > no response and it looks like I forgot about it.
> > >
> > > http://lists.infradead.org/pipermail/linux-arm-kernel/2012-November/129381.html
> > 
> > Yes, same except initialization of data.addr. :)
> > This means there might be no one interested in using
> > ftrace-irqsoff/premptoff in ARM during a couple of months?
> 
> 
> It's been almost a year since we last discussed the patches that were
> posted by Dave and sahara, but nothing has changed in the mainline kernel.
> 
> Any chance that someone could be motivated to pick this work up again
> and finally fix return_address().

I thought that we had _actively_ decided that we would not use the
unwinder for these paths - that it was too expensive for these paths,
and you had to use frame pointers instead.

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