[PATCH] libnvdimm, of_pmem: workaround OF_NUMA=n build error

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Stephen reports that an x86 allmodconfig build fails to build the
of_pmem driver due to a missing definition of of_node_to_nid(). That
helper is currently only exported in the OF_NUMA=y case. In other cases,
ppc and sparc, it is a weak symbol, and outside of those platforms it is
a static inline.

Until an OF_NUMA=n configuration can reliably support usage of
of_node_to_nid() in modules across architectures, mark this driver as
'bool' instead of 'tristate'.

Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Oliver O'Halloran <oohall@xxxxxxxxx>
Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
 drivers/nvdimm/Kconfig |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
index 2d6862bf7436..f6c533c4d09b 100644
--- a/drivers/nvdimm/Kconfig
+++ b/drivers/nvdimm/Kconfig
@@ -103,7 +103,8 @@ config NVDIMM_DAX
 	  Select Y if unsure
 
 config OF_PMEM
-	tristate "Device-tree support for persistent memory regions"
+	# FIXME: make tristate once OF_NUMA dependency removed
+	bool "Device-tree support for persistent memory regions"
 	depends on OF
 	default LIBNVDIMM
 	help

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