linux-kernel - Re: [PATCH v5 01/18] cpu: Do not warn on arch_register_cpu() returning -EPROBE

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Date: Fri, 12 Apr 2024 19:42:20 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: 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>, linuxarm@...wei.com, justin.he@....com, 
	jianyong.wu@....com
Subject: Re: [PATCH v5 01/18] cpu: Do not warn on arch_register_cpu()
 returning -EPROBE_DEFER

On Fri, Apr 12, 2024 at 4:37 PM Jonathan Cameron
<Jonathan.Cameron@...wei.com> wrote:
>
> For arm64 the CPU registration cannot complete until the ACPI intepretter
> us up and running so in those cases the arch specific
> 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>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Acked-by: Rafael J. Wysocki <rafael@...nel.org>

> ---
> v5: New patch.
>     Note that for now no arch_register_cpu() calls return -EPROBE_DEFER
>     so it has no impact until the arm64 one is added later in this series.
> ---
>  drivers/base/cpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index 56fba44ba391..b9d0d14e5960 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 != -EPROBE_DEFER)
>                         pr_warn("register_cpu %d failed (%d)\n", i, ret);
>         }
>  }
> --
> 2.39.2
>