diff --git a/arch/s390/include/asm/system.h b/arch/s390/include/asm/system.h
index 3f2ccb82b863..3a8b26eb1f2e 100644
--- a/arch/s390/include/asm/system.h
+++ b/arch/s390/include/asm/system.h
@@ -458,22 +458,6 @@ static inline unsigned short stap(void)
 	return cpu_address;
 }
 
-static inline u32 cksm(void *addr, unsigned long len)
-{
-	register unsigned long _addr asm("0") = (unsigned long) addr;
-	register unsigned long _len asm("1") = len;
-	unsigned long accu = 0;
-
-	asm volatile(
-		"0:\n"
-		"	cksm	%0,%1\n"
-		"	jnz	0b\n"
-		: "+d" (accu), "+d" (_addr), "+d" (_len)
-		:
-		: "cc", "memory");
-	return accu;
-}
-
 extern void (*_machine_restart)(char *command);
 extern void (*_machine_halt)(void);
 extern void (*_machine_power_off)(void);
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 5663c1f8e46a..505fec06e634 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -24,6 +24,7 @@
 #include <asm/reset.h>
 #include <asm/sclp.h>
 #include <asm/setup.h>
+#include <asm/checksum.h>
 
 #define IPL_PARM_BLOCK_VERSION 0
 
@@ -1359,7 +1360,8 @@ static void dump_reipl_run(struct shutdown_trigger *trigger)
 		"a" (&lowcore_ptr[smp_processor_id()]->ipib));
 #endif
 	asm volatile("stura %0,%1"
-		:: "a" (cksm(reipl_block_actual, reipl_block_actual->hdr.len)),
+		:: "a" (csum_partial(reipl_block_actual,
+				     reipl_block_actual->hdr.len, 0)),
 		"a" (&lowcore_ptr[smp_processor_id()]->ipib_checksum));
 	preempt_enable();
 	dump_run(trigger);
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index cfe782ee6473..1bbae433fbd8 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -24,6 +24,7 @@
 #include <asm/debug.h>
 #include <asm/processor.h>
 #include <asm/irqflags.h>
+#include <asm/checksum.h>
 #include "sclp.h"
 
 #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)
@@ -704,7 +705,8 @@ static int __init zcore_reipl_init(void)
 		free_page((unsigned long) ipl_block);
 		return rc;
 	}
-	if (cksm(ipl_block, ipl_block->hdr.len) != ipib_info.checksum) {
+	if (csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
+	    ipib_info.checksum) {
 		TRACE("Checksum does not match\n");
 		free_page((unsigned long) ipl_block);
 		ipl_block = NULL;