On Thu, Aug 13, 2015 at 04:23:38PM +0300, Boaz Harrosh wrote:
> DAX as is is races against pmem unbind. A synchronization cost
> be paid somewhere to make sure the memremap() mapping is still valid.
Sorry for being so slow, is what I asked. what is exactly "pmem unbind" ?
Currently in my 4.1 Kernel the ioremap is done on modprobe time and
released modprobe --remove time. the --remove can not happen with a mounted
FS dax or not. So what is exactly "pmem unbind". And if there is a new knob
then make it refuse with a raised refcount.
Surprise removal of a PCIe card which is mapped to provide non-volatile
memory for example. Or memory hot swap.