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

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Message-ID: <20200311092718.GG23944@dhcp22.suse.cz>
Date:   Wed, 11 Mar 2020 10:27:18 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        akpm@...ux-foundation.org
Subject: Re: [PATCH v2] x86/mm: Remove the redundant conditional check

On Wed 11-03-20 09:18:23, 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>

Acked-by: Michal Hocko <mhocko@...e.com>
Thanks!

> ---
> v1->v2:
>   Update patch log to make the description clearer per Michal's
>   suggestion.
> 
>  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