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

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Date:	Sun, 14 Nov 2010 14:13:23 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Catalin Marinas <catalin.marinas@....com>
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 Sunday, November 14, 2010, Catalin Marinas <catalin.marinas@....com> wrote:
> 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.

Actually not a problem since LPAE is only enabled by the last patch.
There may be some compiler warnings without 19/20, I need to check.

-- 
Catalin
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