linux-kernel - Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigned long for 32-bit ptes

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Message-ID: <20101115173606.GA31421@n2100.arm.linux.org.uk>
Date:	Mon, 15 Nov 2010 17:36:06 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigned long
	for 32-bit ptes

On Mon, Nov 15, 2010 at 09:39:30AM +0000, Catalin Marinas wrote:
> On 14 November 2010 15:14, Russell King - ARM Linux
> <linux@....linux.org.uk> wrote:
> > There will be compiler warnings because u32 is unsigned int, and we
> > print it as %08lx.  Generic code cases pte values to (long long) and
> > prints them using %08llx.  We should do the same.
> 
> We still need some kind of macro because with LPAE we need %016llx
> since the phys address can go to 40-bit and there are some additional
> bits in the top word. Unless you'd like to always print 16 characters
> even for 32-bit ptes (or if there is some other printk magic I'm not
> aware of).

Eeh?  %08llx prints 8 characters _minimum_.  If it needs more to represent
the number, it will use more characters.  You surely don't think generic
code is brain dead enough to cast something to a 64-bit long long and
then only print 32 bits of it???
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