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s390/smp: use register pair instead of register asm

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Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-06-09 22:59:13 +02:00 committed by Vasily Gorbik
parent 4f38c7aefe
commit ddd38fd261
1 changed files with 11 additions and 11 deletions
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22
arch/s390/kernel/smp.c
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@ -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)