summaryrefslogtreecommitdiff
path: root/include/linux/topology.h
diff options
context:
space:
mode:
authorHeiko Carstens <hca@linux.ibm.com>2021-11-29 14:03:08 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-12-03 15:58:27 +0100
commite795707703b32fecdd7467afcc33ff1e92416c05 (patch)
tree615a631ee947f202dc2f424688da428039469d63 /include/linux/topology.h
parent2c4dcd7fd57b20a21b65da04d89c38a7217d79cf (diff)
topology/sysfs: export cluster attributes only if an architectures has support
The cluster_id and cluster_cpus topology sysfs attributes have been added with commit c5e22feffdd7 ("topology: Represent clusters of CPUs within a die"). They are currently only used for x86, arm64, and riscv (via generic arch topology), however they are still present with bogus default values for all other architectures. Instead of enforcing such new sysfs attributes to all architectures, make them only optional visible if an architecture opts in by defining both the topology_cluster_id and topology_cluster_cpumask attributes. This is similar to what was done when the book and drawer topology levels were introduced: avoid useless and therefore confusing sysfs attributes for architectures which cannot make use of them. This should not break any existing applications, since this is a new interface introduced with the v5.16 merge window. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Link: https://lore.kernel.org/r/20211129130309.3256168-3-hca@linux.ibm.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/topology.h')
-rw-r--r--include/linux/topology.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 8d1bdae76230..d52be69037db 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -183,6 +183,9 @@ static inline int cpu_to_mem(int cpu)
#if defined(topology_die_id) && defined(topology_die_cpumask)
#define TOPOLOGY_DIE_SYSFS
#endif
+#if defined(topology_cluster_id) && defined(topology_cluster_cpumask)
+#define TOPOLOGY_CLUSTER_SYSFS
+#endif
#ifndef topology_physical_package_id
#define topology_physical_package_id(cpu) ((void)(cpu), -1)