On Thu, Aug 13, 2015 at 04:23:38PM +0300, Boaz Harrosh wrote: > > DAX as is is races against pmem unbind. A synchronization cost must > > 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. -- 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>