tree 0f9091d0827916e8a810cff47315445bed81d726
parent 4a370df5534ef727cba9a9d74bf22e0609f91d6e
author Ross Zwisler <ross.zwisler@linux.intel.com> 1439927739 -0600
committer Dan Williams <dan.j.williams@intel.com> 1440094043 -0400

pmem: add copy_from_iter_pmem() and clear_pmem()

Add support for two new PMEM APIs, copy_from_iter_pmem() and
clear_pmem().  copy_from_iter_pmem() is used to copy data from an
iterator into a PMEM buffer.  clear_pmem() zeros a PMEM memory range.

Both of these new APIs must be explicitly ordered using a wmb_pmem()
function call and are implemented in such a way that the wmb_pmem()
will make the stores to PMEM durable.  Because both APIs are unordered
they can be called as needed without introducing any unwanted memory
barriers.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>