s390/hwcaps: add sanity checks

Add BUILD_BUG_ON() sanity checks to make sure the hwcap string array
contains a string for each hwcap.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/include/asm/elf.h

@@ -114,6 +114,7 @@ enum {
 	HWCAP_NR_VXRS_PDE2	= 19,
 	HWCAP_NR_NNPA		= 20,
 	HWCAP_NR_PCI_MIO	= 21,
+	HWCAP_NR_MAX
 };
 
 /* Bits present in AT_HWCAP. */
@@ -142,6 +143,7 @@ enum {
 
 enum {
 	HWCAP_INT_NR_SIE	= 0,
+	HWCAP_INT_NR_MAX
 };
 
 /* Internal bits, not exposed via elf */

arch/s390/kernel/processor.c

@@ -141,6 +141,8 @@ static void show_cpu_summary(struct seq_file *m, void *v)
 	};
 	int i, cpu;
 
+	BUILD_BUG_ON(ARRAY_SIZE(hwcap_str) != HWCAP_NR_MAX);
+	BUILD_BUG_ON(ARRAY_SIZE(int_hwcap_str) != HWCAP_INT_NR_MAX);
 	seq_printf(m, "vendor_id       : IBM/S390\n"
 		   "# processors    : %i\n"
 		   "bogomips per cpu: %lu.%02lu\n",