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s390/smp: use basic blocks for sigp inline assemblies 

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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17
arch/s390/include/asm/sigp.h
View File

@ -37,8 +37,8 @@
#ifndef __ASSEMBLY__
static inline int __pcpu_sigp(u16 addr, u8 order, unsigned long parm,
u32 *status)
static inline int ____pcpu_sigp(u16 addr, u8 order, unsigned long parm,
u32 *status)
{
register unsigned long reg1 asm ("1") = parm;
int cc;
@ -48,8 +48,19 @@ static inline int __pcpu_sigp(u16 addr, u8 order, unsigned long parm,
" ipm %0\n"
" srl %0,28\n"
: "=d" (cc), "+d" (reg1) : "d" (addr), "a" (order) : "cc");
*status = reg1;
return cc;
}
static inline int __pcpu_sigp(u16 addr, u8 order, unsigned long parm,
u32 *status)
{
u32 _status;
int cc;
cc = ____pcpu_sigp(addr, order, parm, &_status);
if (status && cc == 1)
*status = reg1;
*status = _status;
return cc;
}

8
arch/s390/kernel/smp.c
View File

@ -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;