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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-06-17 08:45:31 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-06-25 07:39:24 (GMT) |
| commit | e7086eb18119933753fceacfee662307b5e1d1c1 (patch) | |
| tree | 7cde8c678f2da02dad30cb914efcbcccee483aab /arch | |
| parent | c50a160c176aadfbbbeed69a55caf1040b22692e (diff) | |
| download | linux-e7086eb18119933753fceacfee662307b5e1d1c1.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/kernel/smp.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 0d9d59d..b3f1e9b 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -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) |