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smp: Fix a potential usage of stale nr_cpus 

The get_option() maybe return 0, it means that the nr_cpus is
not initialized. Then we will use the stale nr_cpus to initialize
the nr_cpu_ids. So fix it.

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200716070457.53255-1-songmuchun@bytedance.com
This commit is contained in:
Muchun Song 2020-07-16 15:04:57 +08:00 committed by Peter Zijlstra
parent 3edecfef02
commit 589343569d
1 changed files with 1 additions and 2 deletions
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3
kernel/smp.c
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@ -634,8 +634,7 @@ static int __init nrcpus(char *str)
{
int nr_cpus;
get_option(&str, &nr_cpus);
if (nr_cpus > 0 && nr_cpus < nr_cpu_ids)
if (get_option(&str, &nr_cpus) && nr_cpus > 0 && nr_cpus < nr_cpu_ids)
nr_cpu_ids = nr_cpus;
return 0;