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authorDan Williams <dan.j.williams@intel.com>2017-05-30 09:11:57 +0300
committerDan Williams <dan.j.williams@intel.com>2017-06-28 02:44:01 +0300
commitc00b396ef782cb2296200d868a0013d8ca1d615e (patch)
tree542357c67a14f7de237780ed4fe8415a780c30b4 /drivers/nvdimm/region_devs.c
parentca6a4657e5420dec727256717e905ebc3c751352 (diff)
downloadlinux-c00b396ef782cb2296200d868a0013d8ca1d615e.tar.xz
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>
Diffstat (limited to 'drivers/nvdimm/region_devs.c')
-rw-r--r--drivers/nvdimm/region_devs.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 3c06a6ea6958..41b4cdf5dea8 100644
--- 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++) {