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

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Message-ID: <20200310101044.GE8447@dhcp22.suse.cz>
Date:   Tue, 10 Mar 2020 11:10:44 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, x86@...nel.org
Subject: Re: [PATCH] x86/mm: Remove the redundant conditional check

On Sun 08-03-20 09:35:11, Baoquan He wrote:
> In commit f70029bbaacbfa8f0 ("mm, memory_hotplug: drop CONFIG_MOVABLE_NODE"),
> the dependency on CONFIG_MOVABLE_NODE was removed for N_MEMORY, so the
> conditional check in paging_init() doesn't make any sense any more.
> Remove it.

Please expand more. I would really have to refresh the intention of the
code but from a quick look at the code CONFIG_HIGHMEM still makes
N_MEMORY != N_NORMAL_MEMORY. So what what does this change mean for that
config?

> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
>  arch/x86/mm/init_64.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index abbdecb75fad..0a14711d3a93 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -818,8 +818,7 @@ void __init paging_init(void)
>  	 *	 will not set it back.
>  	 */
>  	node_clear_state(0, N_MEMORY);
> -	if (N_MEMORY != N_NORMAL_MEMORY)
> -		node_clear_state(0, N_NORMAL_MEMORY);
> +	node_clear_state(0, N_NORMAL_MEMORY);
>  
>  	zone_sizes_init();
>  }
> -- 
> 2.17.2
> 

-- 
Michal Hocko
SUSE Labs