x86, pmem: Fix cache flushing for iovec write < 8 bytes
authorBen Hutchings <ben.hutchings@codethink.co.uk>
Tue, 9 May 2017 17:00:43 +0000 (18:00 +0100)
committerDan Williams <dan.j.williams@intel.com>
Tue, 9 May 2017 17:09:26 +0000 (10:09 -0700)
commit8376efd31d3d7c44bd05be337adde023cc531fa1
treea058fa06362f801e82408c20f5d681b7dfcc8a54
parentcf1e22891bee39f50e058bee0827086fd75a8717
x86, pmem: Fix cache flushing for iovec write < 8 bytes

Commit 11e63f6d920d added cache flushing for unaligned writes from an
iovec, covering the first and last cache line of a >= 8 byte write and
the first cache line of a < 8 byte write.  But an unaligned write of
2-7 bytes can still cover two cache lines, so make sure we flush both
in that case.

Cc: <stable@vger.kernel.org>
Fixes: 11e63f6d920d ("x86, pmem: fix broken __copy_user_nocache ...")
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
arch/x86/include/asm/pmem.h