| From | Sasha Levin <> | Subject | [PATCH AUTOSEL for 4.9 152/293] libnvdimm, pmem: fix persistence warning | Date | Mon, 9 Apr 2018 00:24:52 +0000 |
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From: Dan Williams <dan.j.williams@intel.com>
[ Upstream commit c00b396ef782cb2296200d868a0013d8ca1d615e ]
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> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> --- drivers/nvdimm/region_devs.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index f62306246ca4..2ac9c6222914 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -970,8 +970,9 @@ 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++) { -- 2.15.1
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