Commit e7086eb1 authored by Martin Schwidefsky's avatar Martin Schwidefsky

s390/smp: fix sigp cpu detection loop

On a (theoretical) system where the read-cpu-info SCLP command does
not work but SMT is enabled, the sigp detection loop may not find
all configured cores. The maximum CPU address needs to be shifted
with smp_cpu_mt_shift.
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent c50a160c
......@@ -658,7 +658,8 @@ static struct sclp_cpu_info *smp_get_cpu_info(void)
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (info && (use_sigp_detection || sclp_get_cpu_info(info))) {
use_sigp_detection = 1;
for (address = 0; address <= MAX_CPU_ADDRESS;
for (address = 0;
address <= (MAX_CPU_ADDRESS << smp_cpu_mt_shift);
address += (1U << smp_cpu_mt_shift)) {
if (__pcpu_sigp_relax(address, SIGP_SENSE, 0, NULL) ==
SIGP_CC_NOT_OPERATIONAL)
......
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