linux-kernel - RE: [PATCH] acpi: remove length check for large registers

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Message-ID: <94F2FBAB4432B54E8AACC7DFDE6C92E36F48A3FB@ORSMSX101.amr.corp.intel.com>
Date:	Tue, 19 Mar 2013 18:48:58 +0000
From:	"Moore, Robert" <robert.moore@...el.com>
To:	Linn Crosetto <linn@...com>, "Zheng, Lv" <lv.zheng@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] acpi: remove length check for large registers

Linn,

We will integrate this change into ACPICA for the next release, later in March 2013.
Thanks,
Bob


> -----Original Message-----
> From: Linn Crosetto [mailto:linn@...com]
> Sent: Friday, March 15, 2013 12:56 PM
> To: rjw@...k.pl; Moore, Robert; ming.m.lin@...el.com; Zheng, Lv; linux-
> acpi@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org; Linn Crosetto
> Subject: [PATCH] acpi: remove length check for large registers
> 
> The legacy bit width field in the Generic Address Structure is 1 byte,
> limiting the reportable register width to 255 bits. Larger registers will
> cause a length mismatch warning to be printed in acpi_tb_validate_fadt().
> 
> To avoid the warning, disable the length mismatch check for registers
> larger than 255 bits.
> 
> Signed-off-by: Linn Crosetto <linn@...com>
> ---
>  drivers/acpi/acpica/tbfadt.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
> index 74181bf..e87abcd 100644
> --- a/drivers/acpi/acpica/tbfadt.c
> +++ b/drivers/acpi/acpica/tbfadt.c
> @@ -561,6 +561,7 @@ static void acpi_tb_validate_fadt(void)
>  		 * legacy length field and the corresponding 64-bit X length
> field.
>  		 */
>  		if (address64->address &&
> +		    ACPI_MUL_8(length) <= ACPI_UINT8_MAX &&
>  		    (address64->bit_width != ACPI_MUL_8(length))) {
>  			ACPI_BIOS_WARNING((AE_INFO,
>  					   "32/64X length mismatch in FADT/%s:
> %u/%u",
> --
> 1.7.11.3

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