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? 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>