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cacheinfo: clear cache_leaves(cpu) in free_cache_attributes()

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On ARM64, when PPTT(Processor Properties Topology Table) is not
implemented in ACPI boot, we will goto 'free_ci' with the following
print:
  Unable to detect cache hierarchy for CPU 0

But some other codes may still use 'num_leaves' to iterate through the
'info_list', such as get_cpu_cacheinfo_id(). If 'info_list' is NULL , it
would crash. So clear 'num_leaves' in free_cache_attributes().

Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Link: https://lore.kernel.org/r/1626226375-58730-1-git-send-email-wangxiongfeng2@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiongfeng Wang 2021-07-14 09:32:55 +08:00 committed by Greg Kroah-Hartman
parent f04948dea2
commit e022eac85e
1 changed files with 1 additions and 0 deletions
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1
drivers/base/cacheinfo.c
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@ -297,6 +297,7 @@ static void free_cache_attributes(unsigned int cpu)
kfree(per_cpu_cacheinfo(cpu));
per_cpu_cacheinfo(cpu) = NULL;
cache_leaves(cpu) = 0;
}
int __weak init_cache_level(unsigned int cpu)