linux-kernel - Re: [PATCH v5 03/14] arm64/numa: add nid check for memory block

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Date:	Wed, 10 Aug 2016 11:42:19 +0800
From:	"Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:	Hanjun Guo <guohanjun@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	"Frank Rowand" <frowand.list@...il.com>,
	devicetree <devicetree@...r.kernel.org>
CC:	Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	"Tianhong Ding" <dingtianhong@...wei.com>
Subject: Re: [PATCH v5 03/14] arm64/numa: add nid check for memory block



On 2016/8/10 10:12, Hanjun Guo wrote:
> On 2016/8/8 17:18, Zhen Lei wrote:
>> Use the same tactic to cpu and numa-distance nodes.
>>
>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>> ---
>>  arch/arm64/mm/numa.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
>> index c7fe3ec..2601660 100644
>> --- a/arch/arm64/mm/numa.c
>> +++ b/arch/arm64/mm/numa.c
>> @@ -141,6 +141,11 @@ int __init numa_add_memblk(int nid, u64 start, u64 end)
>>  {
>>  	int ret;
>>
>> +	if (nid >= MAX_NUMNODES) {
>> +		pr_warn("NUMA: Node id %u exceeds maximum value\n", nid);
>> +		return -EINVAL;
>> +	}
> 
> I think this check should be added to of_numa_parse_memory_nodes(), which before
> the numa_add_memblk() called, it's the same logic in of_numa_parse_cpu_nodes() and
> the node id is checked before calling numa_add_memblk() in ACPI.

Yes, you are right. This check is arch independent.

> 
> Thanks
> Hanjun
> 
> 
> 
> .
>