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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: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2015-06-17 10:45:31 +02:00
parent c50a160c17
commit e7086eb181
1 changed files with 2 additions and 1 deletions
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3
arch/s390/kernel/smp.c
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@ -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)