linux-kernel - [PATCH v2] cpuidle: psci: Init cpuidle only for present CPUs

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>] [day] [month] [year] [list]

Message-Id: <20241120103749.1450017-1-ping.bai@nxp.com>
Date: Wed, 20 Nov 2024 18:37:49 +0800
From: Jacky Bai <ping.bai@....com>
To: lpieralisi@...nel.org,
	sudeep.holla@....com,
	rafael@...nel.org,
	daniel.lezcano@...aro.org,
	james.morse@....com,
	d-gole@...com
Cc: linux-pm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
	khilman@...libre.com
Subject: [PATCH v2] cpuidle: psci: Init cpuidle only for present CPUs

With 'nosmp' or 'maxcpus=0' boot command line parameters,
the 'cpu_present_mask' may not be the same as 'cpu_possible_mask'.

In current psci cpuidle driver init, for_each_possible_cpu()
is used to init the cpuidle for each possible CPU. but in
drivers/base/cpu.c ->cpu_dev_register_generic(),
for_each_present_cpu() is used to register cpu device for
present CPUs.

When boot system with 'nosmp' or 'maxcpus=0', the cpuidle driver
init failed due to no valid CPU device sysfs node for non-boot CPUs.

[ 0.182993] Failed to register cpuidle device for cpu1

Use for_each_present_cpu() to register cpuidle only for present
CPUs.

Fixes: b0c69e1214bc ("drivers: base: Use present CPUs in GENERIC_CPU_DEVICES")
Signed-off-by: Jacky Bai <ping.bai@....com>
Reviewed-by: Dhruva Gole <d-gole@...com>
---
 drivers/cpuidle/cpuidle-psci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c
index 2562dc001fc1..00117e9b33e8 100644
--- a/drivers/cpuidle/cpuidle-psci.c
+++ b/drivers/cpuidle/cpuidle-psci.c
@@ -410,7 +410,7 @@ static int psci_cpuidle_probe(struct platform_device *pdev)
 	struct cpuidle_driver *drv;
 	struct cpuidle_device *dev;

-	for_each_possible_cpu(cpu) {
+	for_each_present_cpu(cpu) {
 		ret = psci_idle_init_cpu(&pdev->dev, cpu);
 		if (ret)
 			goto out_fail;
-- 
2.34.1