On Tuesday 13 May 2014 09:45:08 Richard Lee wrote: > > On Mon, May 12, 2014 at 3:51 PM, Arnd Bergmann <arnd@xxxxxxxx> 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@xxxxxxxxx> > > > > 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. Ah, for some reason I didn't see your first patch that introduces that counter. Arnd -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>