linux-kernel - [PATCH] kernel/cpu.c: fix init_cpu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220131014648.941629-1-yury.norov@gmail.com>
Date:   Sun, 30 Jan 2022 17:46:48 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Vincent Donnefort <vincent.donnefort@....com>,
        Ingo Molnar <mingo@...nel.org>,
        YueHaibing <yuehaibing@...wei.com>,
        Yuan ZhaoXiong <yuanzhaoxiong@...du.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yury Norov <yury.norov@...il.com>
Subject: [PATCH] kernel/cpu.c: fix init_cpu_online

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@...il.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