s390/cache: prevent rebuild of shared_cpu_list

Browse source

[ Upstream commit cb0cd4ee11 ]

With commit 36bbc5b4ff ("cacheinfo: Allow early detection and population
of cache attributes") the shared cpu list for each cache level higher than
L1 is rebuilt even if the list already has been set up.

This is caused by the removal of the cpumask_empty() check within
cache_shared_cpu_map_setup().

However architectures can enforce that the shared cpu list is not rebuilt
by simply setting cpu_map_populated of the per cpu cache info structure to
true, which is also the fix for this problem.

Before:
$ cat /sys/devices/system/cpu/cpu1/cache/index2/shared_cpu_list
0-7

After:
$ cat /sys/devices/system/cpu/cpu1/cache/index2/shared_cpu_list
1

Fixes: 36bbc5b4ff ("cacheinfo: Allow early detection and population of cache attributes")
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Heiko Carstens 2024-03-02 20:22:09 +01:00 • committed by Sasha Levin

parent e39a3a14ea

commit eabb38ad01

1 changed files with 1 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

1

arch/s390/kernel/cache.c

View file