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s390/smp: use basic blocks for sigp inline assemblies

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Use only simple inline assemblies which consist of a single basic
block if the register asm construct is being used.

Otherwise gcc would generate broken code if the compiler option
--sanitize-coverage=trace-pc would be used.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2016-06-20 14:04:17 +02:00
committed by Martin Schwidefsky
parent a4d9b97cc3
commit 80a60f6ef1
2 changed files with 15 additions and 10 deletions
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8
arch/s390/kernel/smp.c
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@@ -318,17 +318,11 @@ static void pcpu_delegate(struct pcpu *pcpu, void (*func)(void *),
*/
static int pcpu_set_smt(unsigned int mtid)
{
register unsigned long reg1 asm ("1") = (unsigned long) mtid;
int cc;
if (smp_cpu_mtid == mtid)
return 0;
asm volatile(
" sigp %1,0,%2 # sigp set multi-threading\n"
" ipm %0\n"
" srl %0,28\n"
: "=d" (cc) : "d" (reg1), "K" (SIGP_SET_MULTI_THREADING)
: "cc");
cc = __pcpu_sigp(0, SIGP_SET_MULTI_THREADING, mtid, NULL);
if (cc == 0) {
smp_cpu_mtid = mtid;
smp_cpu_mt_shift = 0;