linux-kernel - Re: [PATCH] ARM: imx: Add iram allocator functions

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Message-ID: <20101005075551.GJ11737@pengutronix.de>
Date:	Tue, 5 Oct 2010 09:55:51 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Dinh.Nguyen@...escale.com
Cc:	linux-kernel@...r.kernel.org, amit.kucheria@...onical.com,
	s.hauer@...gutronix.de, grant.likely@...retlab.ca,
	valentin.longchamp@...l.ch, daniel@...aq.de,
	xiao-lizhang@...escale.com, r.schwebel@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de
Subject: Re: [PATCH] ARM: imx: Add iram allocator functions

On Tue, Oct 05, 2010 at 09:44:23AM +0200, Uwe Kleine-König wrote:
> On Mon, Oct 04, 2010 at 07:03:27PM -0500, Dinh.Nguyen@...escale.com wrote:
> > From: Dinh Nguyen <Dinh.Nguyen@...escale.com>
> > 
> > Add iram allocation functions using GENERIC_ALLOCATOR. The
> > allocation size is 4KB multiples to guarantee alignment. The
> > idea for these functions is for i.MX platforms to use them
> > to dynamically allocate IRAM usage.
> > 
> > Applies on 2.6.36-rc6
> > 
> > Signed-off-by: Dinh Nguyen <Dinh.Nguyen@...escale.com>
> > Reviewed-by: Amit Kucheria <amit.kucheria@...onical.com>
> > ---
> >  arch/arm/plat-mxc/Kconfig                   |   10 ++++
> >  arch/arm/plat-mxc/Makefile                  |    1 +
> >  arch/arm/plat-mxc/include/mach/iram_alloc.h |   35 +++++++++++++++
> >  arch/arm/plat-mxc/iram.c                    |   62 +++++++++++++++++++++++++++
> >  4 files changed, 108 insertions(+), 0 deletions(-)
> >  create mode 100644 arch/arm/plat-mxc/include/mach/iram_alloc.h
> >  create mode 100644 arch/arm/plat-mxc/iram.c
> > 
> > diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig
> > index 6785db4..5e4ff93 100644
> > --- a/arch/arm/plat-mxc/Kconfig
> > +++ b/arch/arm/plat-mxc/Kconfig
> > @@ -57,6 +57,16 @@ source "arch/arm/mach-mx5/Kconfig"
> >  
> >  endmenu
> >  
> > +config IRAM_ALLOC
> > +	bool "Enable IRAM allocator"
> > +	default y
> The iram allocator isn't useful taken alone, no?  So I suggest to make
> it 
Hmm.  It seems I forgot to finish this sentence, sorry.

Unless IRAM_ALLOC is an optional feature for new features to come I'd
not make it user selectible, but let the new features select IRAM_ALLOC.
If it's optional I wonder if "default y" should really be done.

Maybe better call the symbol just IRAM?

> > +	iram_pool = gen_pool_create(12, -1);
> 	if (!iram_pool)
> 		...
After rereading the commit log I wondered where the 4 KB are enforced.
Maybe do

	s/12/PAGE_SHIFT/

to make it more obvious?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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