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: <AANLkTimtSUNrO0wZBfyJJ+OJQCDLkXSOiUuzOD+ubv6O@mail.gmail.com>
Date:	Sun, 14 Nov 2010 14:09:48 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	"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 Sunday, November 14, 2010, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Fri, Nov 12, 2010 at 06:00:23PM +0000, Catalin Marinas wrote:
>> From: Will Deacon <will.deacon@....com>
>>
>> When using 2-level paging, pte_t and pmd_t are typedefs for
>> unsigned long but phys_addr_t is a typedef for u32.
>>
>> This patch uses u32 for the page table entry types when
>> phys_addr_t is not 64-bit, allowing the same conversion
>> specifier to be used for physical addresses and page table
>> entries regardless of LPAE.
>
> However, code which prints the value of page table entries assumes that
> they are unsigned long, and places where we store the raw pte value also
> uses 'unsigned long'.
>
> If we're going to make this change, we need to change more places than
> this patch covers.  grep for pte_val to help find those places.

Patch 19/20 introduces a common macro for formatting but we should
probably order the patches a bit to avoid problems if anyone is
bisecting  in the middle of the series.


-- 
Catalin
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