linux-kernel - Re: [PATCH v7 02/16] cpu: Do not warn on arch_register_cpu() returning -EPROBE

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Date: Fri, 26 Apr 2024 19:20:29 +1000
From: Gavin Shan <gshan@...hat.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>,
 linux-pm@...r.kernel.org, loongarch@...ts.linux.dev,
 linux-acpi@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 kvmarm@...ts.linux.dev, x86@...nel.org, Russell King
 <linux@...linux.org.uk>, "Rafael J . Wysocki" <rafael@...nel.org>,
 Miguel Luis <miguel.luis@...cle.com>, James Morse <james.morse@....com>,
 Salil Mehta <salil.mehta@...wei.com>,
 Jean-Philippe Brucker <jean-philippe@...aro.org>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, linuxarm@...wei.com,
 justin.he@....com, jianyong.wu@....com
Subject: Re: [PATCH v7 02/16] cpu: Do not warn on arch_register_cpu()
 returning -EPROBE_DEFER

On 4/18/24 23:53, Jonathan Cameron wrote:
> For arm64 the CPU registration cannot complete until the ACPI
> interpreter us up and running so in those cases the arch specific
               ^^
I guess it's a typo? s/us/is

> arch_register_cpu() will return -EPROBE_DEFER at this stage and the
> registration will be attempted later.
> 
> Suggested-by: Rafael J. Wysocki <rafael@...nel.org>
> Acked-by: Rafael J. Wysocki <rafael@...nel.org>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> 
> ---
> v7: Fix condition to not print the error message of success (thanks Russell!)
> ---
>   drivers/base/cpu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>

> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index 56fba44ba391..7b83e9c87d7c 100644
> --- a/drivers/base/cpu.c
> +++ b/drivers/base/cpu.c
> @@ -558,7 +558,7 @@ static void __init cpu_dev_register_generic(void)
>   
>   	for_each_present_cpu(i) {
>   		ret = arch_register_cpu(i);
> -		if (ret)
> +		if (ret && ret != -EPROBE_DEFER)
>   			pr_warn("register_cpu %d failed (%d)\n", i, ret);
>   	}
>   }