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author | Dan Williams <dan.j.williams@intel.com> | 2016-05-21 18:01:41 (GMT) |
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committer | Dan Williams <dan.j.williams@intel.com> | 2016-05-21 18:01:41 (GMT) |
commit | 5e24c9fd36285535c704e84748d6c890be870fb6 (patch) | |
tree | 72482127094e47042d46d9e8892466852f0e5347 /mm/cma.h | |
parent | c5ed9268643c7c4c9f2aaa0fd4c936095e6480ef (diff) | |
download | linux-5e24c9fd36285535c704e84748d6c890be870fb6.tar.xz |
libnvdimm, dax: fix alignment validation
Testing the dax-device autodetect support revealed a probe failure with
the following result:
dax0.1: bad offset: 0x8200000 dax disabled
The original pfn-device implementation inferred the alignment from
ilog2(offset), now that the alignment is explicit the is_power_of_2()
needs replacing with a real sanity check against the recorded alignment.
Otherwise the alignment check is useless in the implicit case and only
the minimum size of the offset matters.
This self-consistency check is further validated by the probe path that
will re-check that the offset is large enough to contain all the
metadata required to enable the device.
Cc: <stable@vger.kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'mm/cma.h')
0 files changed, 0 insertions, 0 deletions