Commit c00b396e authored May 29, 2017 by Dan Williams

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>

parent ca6a4657

drivers/nvdimm/region_devs.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -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++) {

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