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

Arnd Bergmann
2014-05-12T07:52:27Z

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@gmail.com>

What happens if the first driver then unmaps the area?

Arnd