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Commit e7086eb1 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

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

arch/s390/kernel/smp.c

+2 −1
Original line number Original line Diff line number Diff line
@@ -658,7 +658,8 @@ static struct sclp_cpu_info *smp_get_cpu_info(void) 
	info = kzalloc(sizeof(*info), GFP_KERNEL);

	info = kzalloc(sizeof(*info), GFP_KERNEL);

	if (info && (use_sigp_detection || sclp_get_cpu_info(info))) {

	if (info && (use_sigp_detection || sclp_get_cpu_info(info))) {

		use_sigp_detection = 1;

		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)) {

		     address += (1U << smp_cpu_mt_shift)) {

			if (__pcpu_sigp_relax(address, SIGP_SENSE, 0, NULL) ==

			if (__pcpu_sigp_relax(address, SIGP_SENSE, 0, NULL) ==

			    SIGP_CC_NOT_OPERATIONAL)

			    SIGP_CC_NOT_OPERATIONAL)