linux-kernel - Re: [PATCH] arm64: ARCH_PFN_OFFSET should be unsigned long

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Message-ID: <20141028133651.GA29706@arm.com>
Date:	Tue, 28 Oct 2014 13:36:51 +0000
From:	Will Deacon <will.deacon@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"zhangwm@...vell.com" <zhangwm@...vell.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: ARCH_PFN_OFFSET should be unsigned long

On Tue, Oct 28, 2014 at 12:51:56PM +0000, Arnd Bergmann wrote:
> On Tuesday 28 October 2014 12:36:11 Will Deacon wrote:
> > On Tue, Oct 28, 2014 at 05:44:01AM +0000, Neil Zhang wrote:
> > > pfns are unsigned long, but PHYS_PFN_OFFSET is phys_addr_t. This leads
> > > to page_to_pfn() returning phys_addr_t which cause type mismatches in
> > > some print statements.
> > 
> > Do you have a specific example? Both of those types are 64-bit on arm64.
> > 
> > 
> 
> printf warns about the fact that phys_addr_t is defined as 'u64', which
> is 'unsigned long long' rather than 'unsigned long'. It's the same size
> but not the same printf format string.

Ok, fair enough. I'll let Catalin pick this up for 3.18.

Will
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