libnvdimm: Enable unit test infrastructure compile checks

The infrastructure to mock core libnvdimm routines for unit testing
purposes is prone to bitrot relative to refactoring of that core.  Arrange
for the unit test core to be built when CONFIG_COMPILE_TEST=y.  This does
not result in a functional unit test environment, it is only a helper for
0day to catch unit test build regressions.

Note that there are a few x86isms in the implementation, so this does not
bother compile testing this architectures other than 64-bit x86.

Link: https://lore.kernel.org/r/156763690875.2556198.15786177395425033830.stgit@dwillia2-desk3.amr.corp.intel.com
Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/nvdimm/Kconfig

@@ -118,4 +118,16 @@ config NVDIMM_KEYS
 	depends on ENCRYPTED_KEYS
 	depends on (LIBNVDIMM=ENCRYPTED_KEYS) || LIBNVDIMM=m
 
+config NVDIMM_TEST_BUILD
+	tristate "Build the unit test core"
+	depends on m
+	depends on COMPILE_TEST && X86_64
+	default m if COMPILE_TEST
+	help
+	  Build the core of the unit test infrastructure. The result of
+	  this build is non-functional for unit test execution, but it
+	  otherwise helps catch build errors induced by changes to the
+	  core devm_memremap_pages() implementation and other
+	  infrastructure.
+
 endif

drivers/nvdimm/Makefile

@@ -29,3 +29,7 @@ libnvdimm-$(CONFIG_BTT) += btt_devs.o
 libnvdimm-$(CONFIG_NVDIMM_PFN) += pfn_devs.o
 libnvdimm-$(CONFIG_NVDIMM_DAX) += dax_devs.o
 libnvdimm-$(CONFIG_NVDIMM_KEYS) += security.o
+
+TOOLS := ../../tools
+TEST_SRC := $(TOOLS)/testing/nvdimm/test
+obj-$(CONFIG_NVDIMM_TEST_BUILD) += $(TEST_SRC)/iomap.o