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

Arnd Bergmann arnd at arndb.de
Mon May 12 00:51:41 PDT 2014

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 at gmail.com>

What happens if the first driver then unmaps the area?


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