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From:   Yury Norov <yury.norov@gmail.com>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Vincent Donnefort <vincent.donnefort@arm.com>,
        Ingo Molnar <mingo@kernel.org>,
        YueHaibing <yuehaibing@huawei.com>,
        Yuan ZhaoXiong <yuanzhaoxiong@baidu.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Yury Norov <yury.norov@gmail.com>
Subject: [PATCH] kernel/cpu.c: fix init_cpu_online
Date:   Sun, 30 Jan 2022 17:46:48 -0800
Message-Id: <20220131014648.941629-1-yury.norov@gmail.com>
MIME-Version: 1.0
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cpu_online_mask has an associate counter of online cpus, which must be
initialized in init_cpu_online().

Fixes: 0c09ab96fc82010 (cpu/hotplug: Cache number of online CPUs)
Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 kernel/cpu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 407a2568f35e..cd7605204d4d 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2616,6 +2616,7 @@ void init_cpu_possible(const struct cpumask *src)
 void init_cpu_online(const struct cpumask *src)
 {
 	cpumask_copy(&__cpu_online_mask, src);
+	atomic_set(&__num_online_cpus, cpumask_weight(cpu_online_mask));
 }
 
 void set_cpu_online(unsigned int cpu, bool online)
-- 
2.30.2