> On Mon, May 12, 2014 at 3:51 PM, Arnd Bergmann <[email protected]> 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 <[email protected]> > > 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. Thanks, BRs Richard Lee > Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
