Messages in this thread | | | Date | Thu, 13 Aug 2015 16:41:32 +0200 | From | Christoph Hellwig <> | Subject | Re: [PATCH v5 2/5] allow mapping page-less memremaped areas into KVA |
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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.
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