test_bitmap: unit tests for lib/bitmap.c

This is mainly testing bitmap construction and conversion to/from u32[]
for now.

Tested:
  qemu i386, x86_64, ppc, ppc64 BE and LE, ARM.

Signed-off-by: David Decotigny <decot@googlers.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

lib/Kconfig.debug

@@ -1738,6 +1738,14 @@ config TEST_KSTRTOX
 config TEST_PRINTF
 	tristate "Test printf() family of functions at runtime"
 
+config TEST_BITMAP
+	tristate "Test bitmap_*() family of functions at runtime"
+	default n
+	help
+	  Enable this option to test the bitmap functions at boot.
+
+	  If unsure, say N.
+
 config TEST_RHASHTABLE
 	tristate "Perform selftest on resizable hash table"
 	default n