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

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Date:	Mon, 12 May 2014 09:51:41 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Richard Lee <superlibj8301@...il.com>, 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 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?

	Arnd
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