linux-kernel - Re: [PATCH v3 05/12] arm64, acpi, numa: NUMA support based on SRAT and SLIT

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Date:	Wed, 27 Jan 2016 15:12:15 +0800
From:	Hanjun Guo <guohanjun@...wei.com>
To:	Robert Richter <robert.richter@...iumnetworks.com>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	<linux-acpi@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Shannon Zhao <shannon.zhao@...aro.org>,
	"Steve Capper" <steve.capper@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	"Hanjun Guo" <hanjun.guo@...aro.org>
Subject: Re: [PATCH v3 05/12] arm64, acpi, numa: NUMA support based on SRAT
 and SLIT

On 2016/1/25 18:21, Robert Richter wrote:
> On 23.01.16 17:39:20, Hanjun Guo wrote:
>> diff --git a/arch/arm64/kernel/acpi_numa.c b/arch/arm64/kernel/acpi_numa.c
>> new file mode 100644
>> index 0000000..f7f7533
>> --- /dev/null
>> +++ b/arch/arm64/kernel/acpi_numa.c
>> +/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
>> +int __init acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
>> +{
>> +	u64 start, end;
>> +	int node, pxm;
>> +
>> +	if (srat_disabled())
>> +		return -EINVAL;
>> +
>> +	if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
> Must be:
>
> 	ma->header.length < sizeof(struct acpi_srat_mem_affinity)) {
>
> Allow extensions to struct acpi_srat_mem_affinity in newer versions.

Hmm, I think we need to remove the check here now.

There are three cases:

 - firmware ACPI version is consistent with the ACPICA one, then
   ma->header.length == sizeof(struct acpi_srat_mem_affinity )

 - firmware ACPI version is not consistent with the ACPICA one,
   for example, struct acpi_srat_mem_affinity is extended in
   new ACI version, but the formware is using the older one,
  then it's ok to use
  ma->header.length < sizeof(struct acpi_srat_mem_affinity )

 - but if we use the older kernel + updated new firmware,
   then
   ma->header.length > sizeof(struct acpi_srat_mem_affinity )
  will be the case, right?

>
>> +		bad_srat();
>> +		return -EINVAL;
> We need a pr_err() here to avoid that numa setup fails silently due to
> bad fw. This applies to all error paths.
>
> See my delta patch below. You can merge it with your patch.

Thanks! I wil merge it into next version.

Hanjun