linux-kernel - Re: [RFC 1/2] ACPI, APEI, Add apei_exec_run

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Date:	Tue, 05 Jul 2011 21:53:15 +0800
From:	Gong Chen <clumsycg@...il.com>
To:	Huang Ying <ying.huang@...el.com>
CC:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Tony Luck <tony.luck@...el.com>, linux-acpi@...r.kernel.org,
	Thomas Renninger <trenn@...ell.com>
Subject: Re: [RFC 1/2] ACPI, APEI, Add apei_exec_run_optional

于 2011/7/5 14:07, Huang Ying 写道:
> Some actions in APEI ERST and EINJ tables are optional, for example,
> ACPI_EINJ_BEGIN_OPERATION action is used to do some preparation for
> error injection, and firmware may choose to do nothing here.  While
> some other actions are mandatory, for example, firmware must provide
> ACPI_EINJ_GET_ERROR_TYPE implementation.
>
> Original implementation treats all actions as optional (that is, can
> have no instructions), that may cause issue if firmware does not
> provide some mandatory actions.  To fix this, this patch adds
> apei_exec_run_optional, which should be used for optional actions.
> The original apei_exec_run should be used for mandatory actions.
>
> Cc: Thomas Renninger<trenn@...ell.com>
> Signed-off-by: Huang Ying<ying.huang@...el.com>
> ---
>   drivers/acpi/apei/apei-base.c     |    9 +++++----
>   drivers/acpi/apei/apei-internal.h |   13 ++++++++++++-
>   2 files changed, 17 insertions(+), 5 deletions(-)
>
> --- a/drivers/acpi/apei/apei-base.c
> +++ b/drivers/acpi/apei/apei-base.c
> @@ -157,9 +157,10 @@ EXPORT_SYMBOL_GPL(apei_exec_noop);
>    * Interpret the specified action. Go through whole action table,
>    * execute all instructions belong to the action.
>    */
> -int apei_exec_run(struct apei_exec_context *ctx, u8 action)
> +int __apei_exec_run(struct apei_exec_context *ctx, u8 action,
> +		    bool optional)
>   {
> -	int rc;
> +	int rc = -ENOENT;
>   	u32 i, ip;
>   	struct acpi_whea_header *entry;
>   	apei_exec_ins_func_t run;
> @@ -198,9 +199,9 @@ rewind:
>   			goto rewind;
>   	}
>
> -	return 0;
> +	return !optional&&  rc<  0 ? rc : 0;

if one operation is optional but running into errors when executing this 
kind of command,
here just ignoring it. Is it reasonable ?

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