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

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Message-ID: <Z8fv3X0Pivh8zbMg@cse-cd02-lnx.ap.qualcomm.com>
Date: Wed, 5 Mar 2025 14:31:57 +0800
From: Yuanjie Yang <quic_yuanjiey@...cinc.com>
To: Jacky Bai <ping.bai@....com>, <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>, <quic_tingweiz@...cinc.com>,
        <quic_yuanjiey@...cinc.com>
Subject: Re: [PATCH v2] cpuidle: psci: Init cpuidle only for present CPUs

On Wed, Nov 20, 2024 at 06:37:49PM +0800, Jacky Bai wrote:
> 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
> 

Tested-by: Yuanjie Yang <quic_yuanjiey@...cinc.com>

I meet the same problem, and I test your patch, it is good to me.

Thanks,
Yuanjie