linux-kernel - Re: [PATCH] ARM: mmu: Add debug_ll_io

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Date:	Fri, 14 Jun 2013 11:00:01 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	Russell King <linux@....linux.org.uk>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH] ARM: mmu: Add debug_ll_io_init() mappings to early
 mappings

On 06/14, Stephen Boyd wrote:
> On 06/14, Rob Herring wrote:
> > On 06/12/2013 12:21 PM, Stephen Boyd wrote:
> > > On 06/11, Rob Herring wrote:
> > >> Can you use vm_reserve_area_early here or perhaps just call
> > >> iotable_init instead of create_mapping directly? I don't recall if
> > >> there was some reason I didn't do that.
> > >>
> > > 
> > > I had iotable_init() before but I thought it was better to have
> > > the ->caller argument say debug_ll_io_init() instead of
> > > iotable_init(). Shall I extract out the similar code?
> > 
> > Well, that's always welcome...
> > 
> > Another option would be use __builtin_return_address. That would change
> > vmallocinfo from showing iotable_init to the caller of iotable_init.
> > Arguably, knowing the caller would be better.
> > 
> 
> Ok sounds fair. I'll use iotable_init() and send a follow-up
> patch to make iotable_init() more informative.
> 

Well now I get paging_init() as the function because that's where
we're going to return to. That actually seems less informative.
I'll do the similar code extraction.
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