[S390] Use copy_to_absolute_zero() instead of "stura/sturg"

Use the new copy_to_absolute_zero() function instead of manual "stura"
and "sturg" to make the code shorter and more readable.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 24 deletions

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index e5a72a2b0c5..9e2f6f7c0e5 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1498,30 +1498,12 @@ static struct shutdown_action __refdata dump_action = {
 
 static void dump_reipl_run(struct shutdown_trigger *trigger)
 {
-        preempt_disable();
-        /*
-         * Bypass dynamic address translation (DAT) when storing IPL parameter
-         * information block address and checksum into the prefix area
-         * (corresponding to absolute addresses 0-8191).
-         * When enhanced DAT applies and the STE format control in one,
-         * the absolute address is formed without prefixing. In this case a
-         * normal store (stg/st) into the prefix area would no more match to
-         * absolute addresses 0-8191.
-         */
-#ifdef CONFIG_64BIT
-        asm volatile("sturg %0,%1"
-                :: "a" ((unsigned long) reipl_block_actual),
-                "a" (&lowcore_ptr[smp_processor_id()]->ipib));
-#else
-        asm volatile("stura %0,%1"
-                :: "a" ((unsigned long) reipl_block_actual),
-                "a" (&lowcore_ptr[smp_processor_id()]->ipib));
-#endif
-        asm volatile("stura %0,%1"
-                :: "a" (csum_partial(reipl_block_actual,
-                                     reipl_block_actual->hdr.len, 0)),
-                "a" (&lowcore_ptr[smp_processor_id()]->ipib_checksum));
-        preempt_enable();
+        u32 csum;
+
+        csum = csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
+        copy_to_absolute_zero(&S390_lowcore.ipib_checksum, &csum, sizeof(csum));
+        copy_to_absolute_zero(&S390_lowcore.ipib, &reipl_block_actual,
+                              sizeof(reipl_block_actual));
         dump_run(trigger);
 }