linux-kernel - Re: [PATCH v4 5/6] ARM: zynq: Add OCM controller driver

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Date:	Thu, 27 Nov 2014 14:20:24 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Soren Brinkmann <soren.brinkmann@...inx.com>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Michal Simek <monstr@...str.eu>,
	Josh Cartwright <josh.cartwright@...com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Rob Herring <robherring2@...il.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Joe Perches <joe@...ches.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Antti Palosaari <crope@....fi>,
	Jingoo Han <jg1.han@...sung.com>,
	Sandeep Nair <sandeep_n@...com>,
	Santosh Shilimkar <santosh.shilimkar@...il.com>,
	Andy Gross <agross@...eaurora.org>,
	Thierry Reding <treding@...dia.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 5/6] ARM: zynq: Add OCM controller driver

On Fri, Nov 14, 2014 at 11:52 AM, Michal Simek <michal.simek@...inx.com> wrote:

> The driver provide memory allocator which can
> be used by others drivers to allocate memory inside OCM.
> All location for 64kB blocks are supported

Allocation?

> and driver is trying to allocate the largest continuous
> block of memory.

Isn't all genalloc allocations continuous?

(...)
> +       zynq_ocmc->pool = devm_gen_pool_create(&pdev->dev,
> +                                              ilog2(ZYNQ_OCMC_GRANULARITY),
> +                                              -1);

Do this:

#include <linux/sizes.h>

zynq_ocmc->pool = devm_gen_pool_create(&pdev->dev,
                                       ilog2(SZ_64K),
                                       -1);

And get rid of the #define for ZYNQ_OCMC_GRANULARITY

Yours,
Linus Walleij
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