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: <AANLkTi=FFpCwEhSgs-zOh32JQvqQWqnaQVTitwJeDyzj@mail.gmail.com>
Date:	Mon, 15 Nov 2010 09:51:01 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	"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 15 November 2010 09:47, Arnd Bergmann <arnd@...db.de> wrote:
> On Monday 15 November 2010 10:39:30 Catalin Marinas 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).
>
> Why not just %010llx? That would just be two extra characters.

We still have attributes (like XN, bit 54) stored in the top part of
the pte. This may be of interest when debugging.

-- 
Catalin
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