s390: proper type casts for csum_partial invocations

Keep sparse and other static code checkers from emitting warnings like:

arch/s390/kernel/ipl.c:1549:14: warning: incorrect type in assignment (different base types)
arch/s390/kernel/ipl.c:1549:14:    expected unsigned int [unsigned] csum
arch/s390/kernel/ipl.c:1549:14:    got restricted __wsum

All usages in s390 code are ok. Therefore add proper casts.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/ipl.c

@@ -1546,7 +1546,8 @@ static void dump_reipl_run(struct shutdown_trigger *trigger)
 	unsigned long ipib = (unsigned long) reipl_block_actual;
 	unsigned int csum;
 
-	csum = csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
+	csum = (__force unsigned int)
+	       csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
 	mem_assign_absolute(S390_lowcore.ipib, ipib);
 	mem_assign_absolute(S390_lowcore.ipib_checksum, csum);
 	dump_run(trigger);

arch/s390/kernel/os_info.c

@@ -26,7 +26,7 @@ static struct os_info os_info __page_aligned_data;
 u32 os_info_csum(struct os_info *os_info)
 {
 	int size = sizeof(*os_info) - offsetof(struct os_info, version_major);
-	return csum_partial(&os_info->version_major, size, 0);
+	return (__force u32)csum_partial(&os_info->version_major, size, 0);
 }
 
 /*
@@ -46,7 +46,7 @@ void os_info_entry_add(int nr, void *ptr, u64 size)
 {
 	os_info.entry[nr].addr = (u64)(unsigned long)ptr;
 	os_info.entry[nr].size = size;
-	os_info.entry[nr].csum = csum_partial(ptr, size, 0);
+	os_info.entry[nr].csum = (__force u32)csum_partial(ptr, size, 0);
 	os_info.csum = os_info_csum(&os_info);
 }
 
@@ -93,7 +93,7 @@ static void os_info_old_alloc(int nr, int align)
 		msg = "copy failed";
 		goto fail_free;
 	}
-	csum = csum_partial(buf_align, size, 0);
+	csum = (__force u32)csum_partial(buf_align, size, 0);
 	if (csum != os_info_old->entry[nr].csum) {
 		msg = "checksum failed";
 		goto fail_free;

drivers/s390/char/zcore.c

@@ -272,7 +272,7 @@ static int __init zcore_reipl_init(void)
 		rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
 	else
 		rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
-	if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
+	if (rc || (__force u32)csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
 	    ipib_info.checksum) {
 		TRACE("Checksum does not match\n");
 		free_page((unsigned long) ipl_block);