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authorHeiko Carstens <hca@linux.ibm.com>2021-11-29 14:03:07 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-12-03 15:58:27 +0100
commit2c4dcd7fd57b20a21b65da04d89c38a7217d79cf (patch)
tree49c8631e9c3a340aeed2d9585af7879c1f726a0c /include/linux/topology.h
parent555a0ce4558d87d5b97c4321f34b19e051c7b0c1 (diff)
topology/sysfs: export die attributes only if an architectures has support
The die_id and die_cpus topology sysfs attributes have been added with commit 0e344d8c709f ("cpu/topology: Export die_id") and commit 2e4c54dac7b3 ("topology: Create core_cpus and die_cpus sysfs attributes"). While they are currently only used and useful for x86 they are still present with bogus default values for all 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_die_id and topology_die_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 rather new interface and applications should be able to handle also older kernel versions without such attributes - besides that they contain only useful information for x86. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Link: https://lore.kernel.org/r/20211129130309.3256168-2-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.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 0b3704ad13c8..8d1bdae76230 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -180,6 +180,10 @@ static inline int cpu_to_mem(int cpu)
#endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
+#if defined(topology_die_id) && defined(topology_die_cpumask)
+#define TOPOLOGY_DIE_SYSFS
+#endif
+
#ifndef topology_physical_package_id
#define topology_physical_package_id(cpu) ((void)(cpu), -1)
#endif