[PATCH v3 0/3] x86/cacheinfo: Set the number of leaves per CPU

[Ricardo Neri]

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