diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2025-10-20 16:17:54 +0200 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2025-10-23 16:11:38 +0200 |
| commit | 07a75d08cfa1b883a6e1256666e5f0617ee99231 (patch) | |
| tree | 01f30967746897a41471bd4dbbd61da34bc47a8e | |
| parent | 564ebcae6a0b4a69de79cd40c04ccd1d572e6ecf (diff) | |
s390/smp: Fix fallback CPU detection
In case SCLP CPU detection does not work a fallback mechanism using SIGP is
in place. Since a cleanup this does not work correctly anymore: new CPUs
are only considered if their type matches the boot CPU.
Before the cleanup the information if a CPU type should be considered was
also part of a structure generated by the fallback mechanism and indicated
that a CPU type should not be considered when adding CPUs.
Since the rework a global SCLP state is used instead. If the global SCLP
state indicates that the CPU type should be considered and the fallback
mechanism is used, there may be a mismatch with CPU types if CPUs are
added. This can lead to a system with only a single CPU even tough there
are many more CPUs.
Address this by simply copying the boot cpu type into the generated data
structure from the fallback mechanism.
Reported-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Fixes: d08d94306e90 ("s390/smp: cleanup core vs. cpu in the SCLP interface")
Reviewed-by: Mete Durlu <meted@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| -rw-r--r-- | arch/s390/kernel/smp.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index da84c0dc6b7e..70df4ca5d443 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -697,6 +697,7 @@ static void __ref smp_get_core_info(struct sclp_core_info *info, int early) continue; info->core[info->configured].core_id = address >> smp_cpu_mt_shift; + info->core[info->configured].type = boot_core_type; info->configured++; } info->combined = info->configured; |