sh: Provide a __read_mostly section wrapper.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/asm-sh/cache.h

@@ -19,6 +19,8 @@
 
 #define L1_CACHE_BYTES		(1 << L1_CACHE_SHIFT)
 
+#define __read_mostly __attribute__((__section__(".data.read_mostly")))
+
 #ifndef __ASSEMBLY__
 struct cache_info {
 	unsigned int ways;		/* Number of cache ways */