linux-kernel - Re: [RFC][PATCH 2/2] ARM: ioremap: Add IO mapping space reused support.

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Date:	Tue, 13 May 2014 09:45:08 +0800
From:	Richard Lee <superlibj8301@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Richard Lee <superlibj@...il.com>
Subject: Re: [RFC][PATCH 2/2] ARM: ioremap: Add IO mapping space reused support.

> On Mon, May 12, 2014 at 3:51 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Monday 12 May 2014 10:19:55 Richard Lee wrote:
>> For the IO mapping, for the same physical address space maybe
>> mapped more than one time, for example, in some SoCs:
>> 0x20000000 ~ 0x20001000: are global control IO physical map,
>> and this range space will be used by many drivers.
>> And then if each driver will do the same ioremap operation, we
>> will waste to much malloc virtual spaces.
>>
>> This patch add IO mapping space reused support.
>>
>> Signed-off-by: Richard Lee <superlibj@...il.com>
>
> What happens if the first driver then unmaps the area?
>

If the first driver will unmap the area, it shouldn't do any thing
except decreasing the 'used' counter.

Thanks,

BRs
Richard Lee


>         Arnd
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