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Message-ID: <0cf50b2f-999f-4aab-bc32-15549d48af2c@redhat.com>
Date: Fri, 26 Apr 2024 19:20:29 +1000
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Subject: Re: [PATCH v7 02/16] cpu: Do not warn on arch_register_cpu()
 returning -EPROBE_DEFER
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To: Jonathan Cameron <Jonathan.Cameron@huawei.com>,
 Thomas Gleixner <tglx@linutronix.de>, Peter Zijlstra <peterz@infradead.org>,
 linux-pm@vger.kernel.org, loongarch@lists.linux.dev,
 linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 kvmarm@lists.linux.dev, x86@kernel.org, Russell King
 <linux@armlinux.org.uk>, "Rafael J . Wysocki" <rafael@kernel.org>,
 Miguel Luis <miguel.luis@oracle.com>, James Morse <james.morse@arm.com>,
 Salil Mehta <salil.mehta@huawei.com>,
 Jean-Philippe Brucker <jean-philippe@linaro.org>,
 Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
 Dave Hansen <dave.hansen@linux.intel.com>, linuxarm@huawei.com,
 justin.he@arm.com, jianyong.wu@arm.com
References: <20240418135412.14730-1-Jonathan.Cameron@huawei.com>
 <20240418135412.14730-3-Jonathan.Cameron@huawei.com>
From: Gavin Shan <gshan@redhat.com>
In-Reply-To: <20240418135412.14730-3-Jonathan.Cameron@huawei.com>
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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@kernel.org>
> Acked-by: Rafael J. Wysocki <rafael@kernel.org>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.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@redhat.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);
>   	}
>   }