linux-kernel - Re: [PATCH v2 RESEND 11/18] x86, acpi: Try to find SRAT in firmware earlier.

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Date:	Tue, 06 Aug 2013 17:33:35 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	robert.moore@...el.com, lv.zheng@...el.com, rjw@...k.pl,
	lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, tj@...nel.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 v2 RESEND 11/18] x86, acpi: Try to find SRAT in firmware
 earlier.

On Fri, 2013-08-02 at 17:14 +0800, Tang Chen wrote:
> This patch introduce early_acpi_firmware_srat() to find the
> phys addr of SRAT provided by firmware. And call it in
> find_hotpluggable_memory().
> 
> Since we have initialized acpi_gbl_root_table_list earlier,
> and store all the tables' phys addrs and signatures in it,
> it is easy to find the SRAT.
> 
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
> ---
>  drivers/acpi/acpica/tbxface.c |   32 ++++++++++++++++++++++++++++++++
>  drivers/acpi/osl.c            |   22 ++++++++++++++++++++++
>  include/acpi/acpixf.h         |    4 ++++
>  include/linux/acpi.h          |    4 ++++
>  mm/memory_hotplug.c           |    8 ++++++--
>  5 files changed, 68 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c

Please add "ACPICA" to the patch title.  This patch also needs to be
reviewed by ACPICA folks.

> index ad11162..6a92f12 100644
> --- a/drivers/acpi/acpica/tbxface.c
> +++ b/drivers/acpi/acpica/tbxface.c

 :

> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index dcbca3e..ec490fe 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -53,6 +53,7 @@
>  #include <acpi/acpi.h>
>  #include <acpi/acpi_bus.h>
>  #include <acpi/processor.h>
> +#include <acpi/acpixf.h>
>  
>  #define _COMPONENT		ACPI_OS_SERVICES
>  ACPI_MODULE_NAME("osl");
> @@ -760,6 +761,27 @@ void __init acpi_initrd_override(void *data, size_t size)
>  }
>  #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
>  
> +#ifdef CONFIG_ACPI_NUMA
> +/*******************************************************************************
> + *
> + * FUNCTION:    early_acpi_firmware_srat
> + *
> + * RETURN:      Phys addr of SRAT on success, 0 on error.
> + *
> + * DESCRIPTION: Get the phys addr of SRAT provided by firmware.
> + *
> + ******************************************************************************/
> +phys_addr_t __init early_acpi_firmware_srat(void)
> +{
> +	struct acpi_table_desc table_desc;
> +
> +	if (acpi_get_table_desc(ACPI_SIG_SRAT, &table_desc))

This check should use ACPI_FAILURE() macro:

  if (ACPI_FAILURE(acpi_get_table_desc(ACPI_SIG_SRAT, &table_desc))

Thanks,
-Toshi


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