linux-kernel - Re: [PATCH 2/2] x86/mm/numa: remove the numa_nodemask_from

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Date:   Tue, 14 Mar 2017 10:50:12 +0800
From:   Wei Yang <richard.weiyang@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Wei Yang <richard.weiyang@...il.com>, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, tj@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/mm/numa: remove the numa_nodemask_from_meminfo()

On Mon, Mar 13, 2017 at 02:30:46PM +0100, Borislav Petkov wrote:
>On Mon, Feb 06, 2017 at 11:35:29PM +0800, Wei Yang wrote:
>> numa_nodemask_from_meminfo() is called to set bit according to
>> numa_meminfo. While the only two places for this call is used to set proper
>> bit to a copy of numa_nodes_parsed from numa_meminfo. With current code
>> path, those numa node information in numa_meminfo is a subset of
>> numa_nodes_parsed. So it is not necessary to set the bits again.
>> 
>> The following is a code path analysis to prove the numa node information in
>> numa_meminfo is a subset of numa_nodes_parsed.
>> 
>>     x86_numa_init()
>>         numa_init()
>>             Case 1
>>             acpi_numa_init()
>>                 acpi_parse_memory_affinity()
>>                     numa_add_memblk()
>>                     node_set(numa_nodes_parsed)
>>                 acpi_parse_slit()
>>                     numa_nodemask_from_meminfo()
>> 
>>             Case 2
>>             amd_numa_init()
>>                 numa_add_memblk()
>>                 node_set(numa_nodes_parsed)
>> 
>>             Case 3
>>             dummy_numa_init()
>>                 node_set(numa_nodes_parsed)
>>                 numa_add_memblk()
>> 
>>             numa_register_memblks()
>>                 numa_nodemask_from_meminfo()
>
>What about of_numa_parse_memory_nodes() ?
>

Hi, Borislav

Glad to see your comment.

Here is the only place who will invoke of_numa_parse_memory_nodes()

    arm64_numa_init()
        of_numa_init()
	    of_numa_parse_memory_nodes()

So this is an arm64 specific function.

In this patch, these numa_nodemask_from_meminfo only affects x86.

>-- 
>Regards/Gruss,
>    Boris.
>
>Good mailing practices for 400: avoid top-posting and trim the reply.

-- 
Wei Yang
Help you, Help me

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