[S390] Bad kexec control page allocation.

KEXEC_CONTROL_MEMORY_LIMIT is an unsigned long value and therefore
should be defined as one. Otherwise the kexec control page can be
allocated above 2GB which will cause a specification exception on the
sam31 instruction in the s390 kexec relocation code.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

include/asm-s390/kexec.h

@@ -26,7 +26,7 @@
 
 /* Maximum address we can use for the control pages */
 /* Not more than 2GB */
-#define KEXEC_CONTROL_MEMORY_LIMIT (1<<31)
+#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
 
 /* Allocate one page for the pdp and the second for the code */
 #define KEXEC_CONTROL_CODE_SIZE 4096