linux-kernel - Re: [PATCH 09/20] ARM64 / ACPI: Implement core functions for parsing MADT table

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Date:	Fri, 17 Jan 2014 15:12:42 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Grant Likely <grant.likely@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <robh@...nel.org>,
	Mark Rutland <mark.rutland@....com>, patches@...aro.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	linaro-acpi@...ts.linaro.org, Charles.Garcia-Tobin@....com
Subject: Re: [PATCH 09/20] ARM64 / ACPI: Implement core functions for parsing MADT table

On Friday 17 January 2014, Hanjun Guo wrote:
>  
> +/*
> + * Local interrupt controller address,
> + * GIC cpu interface base address on ARM/ARM64
> + */
> +static u64 acpi_lapic_addr __initdata;

If it's cpu local, don't you need more than one address to support SMP?
Also, the variable appears to be write-only.

> +#define BAD_MADT_ENTRY(entry, end) (					\
> +	(!entry) || (unsigned long)entry + sizeof(*entry) > end ||	\
> +	((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
> +

Better make this an inline function.

> +static int __init
> +acpi_parse_gic(struct acpi_subtable_header *header, const unsigned long end)
> +{
> +	struct acpi_madt_generic_interrupt *processor = NULL;
> +
> +	processor = (struct acpi_madt_generic_interrupt *)header;

You don't need the initialization in the first line when you write to the
variable before reading it. Same in the other functions.

	Arnd
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