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 <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Ross Zwisler <[email protected]> Reviewed-by: Jan Kara <[email protected]> Signed-off-by: Dan Williams <[email protected]>
maraz · Jun 27, 2017 · c00b396 · c00b396
1 parent ca6a465
commit c00b396
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
@@ -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++) {