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| author | Heiko Carstens <hca@linux.ibm.com> | 2022-10-31 14:11:57 +0100 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2022-11-23 16:22:21 +0100 |
| commit | 254b2fd02e34a5761cd2a3aad8b24a7ddd8962e1 (patch) | |
| tree | 542937306fd49187b34496ef71f76246f046292d /arch/s390/Kconfig | |
| parent | 2e71df94695cdc930fb373575ea4edabd4e4bcc7 (diff) | |
| download | lwn-254b2fd02e34a5761cd2a3aad8b24a7ddd8962e1.tar.gz lwn-254b2fd02e34a5761cd2a3aad8b24a7ddd8962e1.zip | |
s390/mm: provide minimal setup_per_cpu_areas() implementation
s390 allows to enable CONFIG_NUMA, mainly to enable a couple of system
calls which are only present if NUMA is enabled. The NUMA specific system
calls are required by a couple of applications, which wouldn't work if the
system calls wouldn't be present.
The NUMA implementation itself maps all CPUs and memory to node 0. A
special case is the generic percpu setup code, which doesn't expect an s390
like implementation and therefore emits a message/warning:
"percpu: cpu 0 has no node -1 or node-local memory".
In order to get rid of this message, and also to provide sane CPU to node
and CPU distance mappings implement a minimal setup_per_cpu_areas()
function, which is very close to the generic variant.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index a006dbb44890..0c154e8bc4f5 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -197,6 +197,7 @@ config S390 select HAVE_RSEQ select HAVE_SAMPLE_FTRACE_DIRECT select HAVE_SAMPLE_FTRACE_DIRECT_MULTI + select HAVE_SETUP_PER_CPU_AREA select HAVE_SOFTIRQ_ON_OWN_STACK select HAVE_SYSCALL_TRACEPOINTS select HAVE_VIRT_CPU_ACCOUNTING @@ -208,6 +209,7 @@ config S390 select MMU_GATHER_MERGE_VMAS select MODULES_USE_ELF_RELA select NEED_DMA_MAP_STATE if PCI + select NEED_PER_CPU_EMBED_FIRST_CHUNK select NEED_SG_DMA_LENGTH if PCI select OLD_SIGACTION select OLD_SIGSUSPEND3 |