linux-kernel - Re: [PATCH v4 1/2] ACPI / ARM64: add BAD_MADT_GICC

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Date:	Tue, 7 Jul 2015 10:25:16 +0100
From:	Will Deacon <will.deacon@....com>
To:	Al Stone <al.stone@...aro.org>
Cc:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"lenb@...nel.org" <lenb@...nel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"patches@...aro.org" <patches@...aro.org>
Subject: Re: [PATCH v4 1/2] ACPI / ARM64: add BAD_MADT_GICC_ENTRY() macro

On Tue, Jul 07, 2015 at 12:16:47AM +0100, Al Stone wrote:
> From: Al Stone <al.stone@...naro.org>
> 
> The BAD_MADT_ENTRY() macro is designed to work for all of the subtables
> of the MADT.  In the ACPI 5.1 version of the spec, the struct for the
> GICC subtable (struct acpi_madt_generic_interrupt) is 76 bytes long; in
> ACPI 6.0, the struct is 80 bytes long.  But, there is only one definition
> in ACPICA for this struct -- and that is the 6.0 version.  Hence, when
> BAD_MADT_ENTRY() compares the struct size to the length in the GICC
> subtable, it fails if 5.1 structs are in use, and there are systems in
> the wild that have them.
> 
> This patch adds the BAD_MADT_GICC_ENTRY() that checks the GICC subtable
> only, accounting for the difference in specification versions that are
> possible.  The BAD_MADT_ENTRY() will continue to work as is for all other
> MADT subtables.
> 
> This code is being added to an arm64 header file since that is currently
> the only architecture using the GICC subtable of the MADT.  As a GIC is
> specific to ARM, it is also unlikely the subtable will be used elsewhere.
> 
> Fixes: aeb823bbacc2 (ACPICA: ACPI 6.0: Add changes for FADT table.)
> Signed-off-by: Al Stone <al.stone@...aro.org>
> ---
>  arch/arm64/include/asm/acpi.h | 8 ++++++++
>  1 file changed, 8 insertions(+)

Not the nicest patch I've ever seen, but if it gets things working again:

  Acked-by: Will Deacon <will.deacon@....com>

Catalin, I assume you're picking these two up for 4.2?

Will
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