s390/smp: use register pair instead of register asm

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index e137c84..c8493e7 100644 (file)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -1233,21 +1233,21 @@ subsys_initcall(s390_smp_init);
 
 static __always_inline void set_new_lowcore(struct lowcore *lc)
 {
-       struct lowcore *old_lc = &S390_lowcore;
-       struct lowcore *new_lc = lc;
+       union register_pair dst, src;
        u32 pfx;
-       register struct lowcore *reg2 asm ("2") = new_lc;
-       register unsigned long   reg3 asm ("3") = sizeof(*reg2);
-       register struct lowcore *reg4 asm ("4") = old_lc;
-       register unsigned long   reg5 asm ("5") = sizeof(*reg4);
+
+       src.even = (unsigned long) &S390_lowcore;
+       src.odd  = sizeof(S390_lowcore);
+       dst.even = (unsigned long) lc;
+       dst.odd  = sizeof(*lc);
+       pfx = (unsigned long) lc;
 
        asm volatile(
-               "       st      2,%[pfx]\n"
-               "       mvcl    2,4\n"
+               "       mvcl    %[dst],%[src]\n"
                "       spx     %[pfx]\n"
-               : "+&d" (reg2), "+&d" (reg3),
-                 "+&d" (reg4), "+&d" (reg5), [pfx] "=Q" (pfx)
-               : : "memory", "cc");
+               : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair)
+               : [pfx] "Q" (pfx)
+               : "memory", "cc");
 }
 
 static int __init smp_reinit_ipl_cpu(void)