linux-kernel - Re: [PATCH 13/21] x86, acpi: Try to find SRAT in firmware earlier.

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Message-ID: <20130723204949.GR21100@mtj.dyndns.org>
Date:	Tue, 23 Jul 2013 16:49:49 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, trenn@...e.de, yinghai@...nel.org,
	jiang.liu@...wei.com, wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com,
	yanghy@...fujitsu.com, x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 13/21] x86, acpi: Try to find SRAT in firmware earlier.

On Fri, Jul 19, 2013 at 03:59:26PM +0800, Tang Chen wrote:
> +/*

/**

> + * acpi_get_table_desc - Get the acpi table descriptor of a specific table.
> + * @signature: The signature of the table to be found.
> + * @out_desc: The out returned descriptor.
> + *
> + * This function iterates acpi_gbl_root_table_list and find the specified
> + * table's descriptor.
> + *
> + * NOTE: The caller has the responsibility to allocate memory for @out_desc.
> + *
> + * Return AE_OK on success, AE_NOT_FOUND if the table is not found.
> + */
> +acpi_status acpi_get_table_desc(char *signature,
> +				struct acpi_table_desc *out_desc)
> +{
> +	int pos;
> +
> +	for (pos = 0;
> +	     pos < acpi_gbl_root_table_list.current_table_count;
> +	     pos++) {
> +		if (!ACPI_COMPARE_NAME
> +		    (&(acpi_gbl_root_table_list.tables[pos].signature),
> +		    signature))

Hohumm... creative formatting.  Can't you just cache the tables
pointer in a local variable with short name and avoid the creativity?

> +			continue;
> +
> +		memcpy(out_desc, &acpi_gbl_root_table_list.tables[pos],
> +		       sizeof(struct acpi_table_desc));
> +
> +		return_ACPI_STATUS(AE_OK);
> +	}
> +
> +	return_ACPI_STATUS(AE_NOT_FOUND);

Also, if we already know that SRAT is what we want, I wonder whether
it'd be simpler to store the location of SRAT somewhere instead of
trying to be generic with the early processing.

Thanks.

-- 
tejun
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