linux-kernel - Re: [PATCH v2] x86/mm: Remove the redundant conditional check

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Message-ID: <20200315215657.hojujnc2ru5jd26n@master>
Date:   Sun, 15 Mar 2020 21:56:57 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     Wei Yang <richard.weiyang@...il.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, x86@...nel.org, mhocko@...e.com,
        akpm@...ux-foundation.org
Subject: Re: [PATCH v2] x86/mm: Remove the redundant conditional check

On Sun, Mar 15, 2020 at 08:49:13PM +0800, Baoquan He wrote:
>On 03/14/20 at 03:10pm, Wei Yang wrote:
>> On Wed, Mar 11, 2020 at 09:18:23AM +0800, Baoquan He wrote:
>> >In commit f70029bbaacb ("mm, memory_hotplug: drop CONFIG_MOVABLE_NODE"),
>> >the dependency on CONFIG_MOVABLE_NODE was removed for N_MEMORY. Before
>> >commit f70029bbaacb, CONFIG_HIGHMEM && !CONFIG_MOVABLE_NODE could make
>> >(N_MEMORY == N_NORMAL_MEMORY) be true. After commit f70029bbaacb, N_MEMORY
>> >doesn't have any chance to be equal to N_NORMAL_MEMORY. So the conditional
>> >check in paging_init() doesn't make sense any more. Let's remove it.
>> >
>> >Signed-off-by: Baoquan He <bhe@...hat.com>
>> 
>> The change looks good. While I have one question, we set default value for
>> N_HIGH_MEMORY. Why we don't clear this too?
>
>This is for x86_64 only, there's no node_state for N_HIGH_MEMORY.
>

Thanks, I see it in arch/x86/Kconfig.

-- 
Wei Yang
Help you, Help me