Re: [PATCH RFC 12/22] drivers: base: Print a warning instead of panic() when register_cpu() fails

[Shaoqin Huang]

On 11/7/23 18:30, Russell King (Oracle) wrote:
> From: James Morse <james.morse@xxxxxxx>
>
> loongarch, mips, parisc, riscv and sh all print a warning if
> register_cpu() returns an error. Architectures that use
> GENERIC_CPU_DEVICES call panic() instead.
>
> Errors in this path indicate something is wrong with the firmware
> description of the platform, but the kernel is able to keep running.
>
> Downgrade this to a warning to make it easier to debug this issue.
>
> This will allow architectures that switching over to GENERIC_CPU_DEVICES
> to drop their warning, but keep the existing behaviour.
>
> Signed-off-by: James Morse <james.morse@xxxxxxx>
> Reviewed-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
Reviewed-by: Shaoqin Huang <shahuang@xxxxxxxxxx>
> ---
>   drivers/base/cpu.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index 221ffbeb1c9b..82b6a76125f5 100644
> --- a/drivers/base/cpu.c
> +++ b/drivers/base/cpu.c
> @@ -551,14 +551,15 @@ void __weak arch_unregister_cpu(int num)
>   
>   static void __init cpu_dev_register_generic(void)
>   {
> -	int i;
> +	int i, ret;
>   
>   	if (!IS_ENABLED(CONFIG_GENERIC_CPU_DEVICES))
>   		return;
>   
>   	for_each_present_cpu(i) {
> -		if (arch_register_cpu(i))
> -			panic("Failed to register CPU device");
> +		ret = arch_register_cpu(i);
> +		if (ret)
> +			pr_warn("register_cpu %d failed (%d)\n", i, ret);
>   	}
>   }
>   

--
Shaoqin