Hi,
This is v3 of a patchset to set the number of cache leaves independently for each CPU. v1 and v2 can be found here [1] and here [2].
Changes since v2: * This version uncovered a NULL-pointer dereference in recent changes to cacheinfo[3]. This dereference is observed when the system does not configure cacheinfo early during boot nor makes corrections later during CPU hotplug; as is the case in x86. Patch 1 fixes this issue.
Changes since v1: * Dave Hansen suggested to use the existing per-CPU ci_cpu_cacheinfo variable. Now the global variable num_cache_leaves became useless. * While here, I noticed that init_cache_level() also became useless: x86 does not need ci_cpu_cacheinfo::num_levels.
[1]. https://lore.kernel.org/lkml/20230314231658.30169-1-ricardo.neri-calderon@li... [2]. https://lore.kernel.org/all/20230424001956.21434-1-ricardo.neri-calderon@lin... [3]. https://lore.kernel.org/all/20230412185759.755408-1-rrendec@redhat.com/
Ricardo Neri (3): cacheinfo: Allocate memory for memory if not done from the primary CPU x86/cacheinfo: Delete global num_cache_leaves x86/cacheinfo: Clean out init_cache_level()
arch/x86/kernel/cpu/cacheinfo.c | 50 ++++++++++++++++----------------- drivers/base/cacheinfo.c | 6 +++- 2 files changed, 30 insertions(+), 26 deletions(-)