linux-kernel - Re: [PATCH v6 3/7] acpi: apei: remove the unused code

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Message-ID: <59A84C51.3000506@arm.com>
Date:   Thu, 31 Aug 2017 18:50:09 +0100
From:   James Morse <james.morse@....com>
To:     Dongjiu Geng <gengdongjiu@...wei.com>
CC:     christoffer.dall@...aro.org, marc.zyngier@....com,
        rkrcmar@...hat.com, linux@...linux.org.uk, catalin.marinas@....com,
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Subject: Re: [PATCH v6 3/7] acpi: apei: remove the unused code

Hi Dongjiu Geng,

On 28/08/17 11:38, Dongjiu Geng wrote:
> In current code logic, the two functions ghes_sea_add() and
> ghes_sea_remove() are only called when CONFIG_ACPI_APEI_SEA
> is defined. If not, it will return errors in the ghes_probe()
> and not contiue. Hence, remove the unnecessary handling when
> CONFIG_ACPI_APEI_SEI is not defined.

This doesn't match what the patch does. I get this feeling this is needed for
some future patch you haven't included.


> change since v5:
> 1. remove the SEI notification type handling, because the SEI is
>    asynchronous exception and the address is not accurate. so
>    not call memory_failure() to handle it.

Setting NOTIFY_SEI as the GHES entry's notification type means the OS should
check the GHES->ErrorStatusAddress for CPER records when it receives an
SError-Interrupt, as it may be a notification of an error from this error source.

If you aren't handling the notification, why is this is in the HEST at all?
(and if its not: its not firmware-first)


James


> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index d661d452b238..c15a08db2c7c 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -813,7 +813,6 @@ static struct notifier_block ghes_notifier_hed = {
>  	.notifier_call = ghes_notify_hed,
>  };
>
> -#ifdef CONFIG_ACPI_APEI_SEA
>  static LIST_HEAD(ghes_sea);
>
>  /*
> @@ -848,19 +847,6 @@ static void ghes_sea_remove(struct ghes *ghes)
>  	mutex_unlock(&ghes_list_mutex);
>  	synchronize_rcu();
>  }
> -#else /* CONFIG_ACPI_APEI_SEA */
> -static inline void ghes_sea_add(struct ghes *ghes)
> -{
> -	pr_err(GHES_PFX "ID: %d, trying to add SEA notification which is not
supported\n",
> -	       ghes->generic->header.source_id);
> -}
> -
> -static inline void ghes_sea_remove(struct ghes *ghes)
> -{
> -	pr_err(GHES_PFX "ID: %d, trying to remove SEA notification which is not
supported\n",
> -	       ghes->generic->header.source_id);
> -}
> -#endif /* CONFIG_ACPI_APEI_SEA */
>
>  #ifdef CONFIG_HAVE_ACPI_APEI_NMI
>  /*
>