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libnvdimm, pmem: fix persistence warning 

The pmem driver assumes if platform firmware describes the memory
devices associated with a persistent memory range and
CONFIG_ARCH_HAS_PMEM_API=y that it has all the mechanism necessary to
flush data to a power-fail safe zone. We warn if the firmware does not
describe memory devices, but we also need to warn if the architecture
does not claim pmem support.

Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
zero-colors
Dan Williams 2017-05-29 23:11:57 -07:00
parent ca6a4657e5
commit c00b396ef7
1 changed files with 3 additions and 2 deletions
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5
drivers/nvdimm/region_devs.c
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@ -1037,8 +1037,9 @@ int nvdimm_has_flush(struct nd_region *nd_region)
{
int i;
/* no nvdimm == flushing capability unknown */
if (nd_region->ndr_mappings == 0)
/* no nvdimm or pmem api == flushing capability unknown */
if (nd_region->ndr_mappings == 0
|| !IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API))
return -ENXIO;
for (i = 0; i < nd_region->ndr_mappings; i++) {