linux-kernel - Re: [PATCH RFC 51/51] ARM: 7805/1: mm: change max*pfn to include the physical offset of memory

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Date:	Tue, 6 Aug 2013 09:51:23 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Rob Herring <robherring2@...il.com>
Cc:	Santosh Shilimkar <santosh.shilimkar@...com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH RFC 51/51] ARM: 7805/1: mm: change max*pfn to include
	the physical offset of memory

On Mon, Aug 05, 2013 at 10:15:11PM -0500, Rob Herring wrote:
> On Thu, Aug 1, 2013 at 5:25 PM, Santosh Shilimkar
> <santosh.shilimkar@...com> wrote:
> > +/* The ARM override for dma_max_pfn() */
> > +static inline unsigned long dma_max_pfn(struct device *dev)
> > +{
> > +       return PHYS_PFN_OFFSET + dma_to_pfn(dev, *dev->dma_mask);
> 
> Do we need to handle dev == NULL case?

No, look at where it's used and the code it's replacing.  You'll find
that its callsites handle the dev = NULL case.
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