Re: [PATCH 09/20] ARM64 / ACPI: Implement core functions for parsingMADT table
From: Hanjun Guo
Date: Mon Jan 20 2014 - 03:49:24 EST
On 2014-1-17 22:12, Arnd Bergmann wrote:
> 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?
Good point, thanks for pointing this out. I have a question, do we really
have some SoCs without banked registers?
I ask this question because we can do something for GIC cpu interface
with per cpu offset, but ACPI do NOT support per cpu offset for GIC
> Also, the variable appears to be write-only.
Actually not, it will be used for GIC initialization.
>> +#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.
Ok, I will update them all in next version.
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