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@xxxxxxxxxxxxxxx/
[2]. https://lore.kernel.org/all/20230424001956.21434-1-ricardo.neri-calderon@xxxxxxxxxxxxxxx/
[3]. https://lore.kernel.org/all/20230412185759.755408-1-rrendec@xxxxxxxxxx/
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(-)
--
2.25.1
