[PATCH] s390: add read_mostly optimization

Add a read_mostly section and define __read_mostly to prevent cache line
pollution due to writes for mostly read variables.  In addition fix the
incorrect alignment of the cache_line_aligned data section.  s390 has a
cacheline size of 256 bytes.

Signed-off-by: Christian Borntraeger <cborntra@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-s390/cache.h

@@ -16,4 +16,6 @@
 
 #define ARCH_KMALLOC_MINALIGN	8
 
+#define __read_mostly __attribute__((__section__(".data.read_mostly")))
+
 #endif