dax: add missing MODULE_DESCRIPTION() macros

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dax/hmem/dax_hmem.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dax/device_dax.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dax/kmem.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dax/dax_pmem.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dax/dax_cxl.o

Add all missing invocations of the MODULE_DESCRIPTION() macro.

[iweiny: edit descriptions]
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://patch.msgid.link/r/20240605-md-drivers-dax-v1-1-3d448f3368b4@quicinc.comSigned-off-by: Ira Weiny <ira.weiny@intel.com>

drivers/dax/cxl.c

@@ -43,6 +43,7 @@ static struct cxl_driver cxl_dax_region_driver = {
 
 module_cxl_driver(cxl_dax_region_driver);
 MODULE_ALIAS_CXL(CXL_DEVICE_DAX_REGION);
+MODULE_DESCRIPTION("CXL DAX: direct access to CXL regions");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Intel Corporation");
 MODULE_IMPORT_NS(CXL);

drivers/dax/device.c

@@ -482,6 +482,7 @@ static void __exit dax_exit(void)
 }
 
 MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Device DAX: direct access device driver");
 MODULE_LICENSE("GPL v2");
 module_init(dax_init);
 module_exit(dax_exit);

drivers/dax/hmem/hmem.c

@@ -168,5 +168,6 @@ MODULE_SOFTDEP("pre: cxl_acpi");
 
 MODULE_ALIAS("platform:hmem*");
 MODULE_ALIAS("platform:hmem_platform*");
+MODULE_DESCRIPTION("HMEM DAX: direct access to 'specific purpose' memory");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Intel Corporation");

drivers/dax/kmem.c

@@ -299,6 +299,7 @@ static void __exit dax_kmem_exit(void)
 }
 
 MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("KMEM DAX: map dax-devices as System-RAM");
 MODULE_LICENSE("GPL v2");
 module_init(dax_kmem_init);
 module_exit(dax_kmem_exit);

drivers/dax/pmem.c

@@ -94,6 +94,7 @@ static void __exit dax_pmem_exit(void)
 }
 module_exit(dax_pmem_exit);
 
+MODULE_DESCRIPTION("PMEM DAX: direct access to persistent memory");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Intel Corporation");
 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);

drivers/dax/super.c

@@ -606,6 +606,7 @@ static void __exit dax_core_exit(void)
 }
 
 MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("DAX: direct access to differentiated memory");
 MODULE_LICENSE("GPL v2");
 subsys_initcall(dax_core_init);
 module_exit(dax_core_exit);