linux-kernel - Re: [tip: x86/mm] x86/mm: Remove the now redundant N

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Date:   Wed, 18 Mar 2020 10:49:42 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Borislav Petkov <bp@...e.de>, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [tip: x86/mm] x86/mm: Remove the now redundant N_MEMORY check

Hi,

On 03/17/20 at 06:20pm, tip-bot2 for Baoquan He wrote:
> The following commit has been merged into the x86/mm branch of tip:
> 
> Commit-ID:     aa61ee7b9ee3cb84c0d3a842b0d17937bf024c46
> Gitweb:        https://git.kernel.org/tip/aa61ee7b9ee3cb84c0d3a842b0d17937bf024c46
> Author:        Baoquan He <bhe@...hat.com>
> AuthorDate:    Wed, 11 Mar 2020 09:18:23 +08:00
> Committer:     Borislav Petkov <bp@...e.de>
> CommitterDate: Tue, 17 Mar 2020 19:12:39 +01:00

Just a soft reminder, I also got a notice from Andrew that this was picked 
into his -mm tree before. Maybe one can be dropped to avoid conflict
when sending to Linus.

Thanks for taking care of this.

> 
> x86/mm: Remove the now redundant N_MEMORY check
> 
> In commit
> 
>   f70029bbaacb ("mm, memory_hotplug: drop CONFIG_MOVABLE_NODE")
> 
> the dependency on CONFIG_MOVABLE_NODE was removed for N_MEMORY.
> Before, CONFIG_HIGHMEM && !CONFIG_MOVABLE_NODE could make (N_MEMORY ==
> N_NORMAL_MEMORY) be true.
> 
> After that commit, N_MEMORY cannot be equal to N_NORMAL_MEMORY. So the
> conditional check in paging_init() is not needed anymore, remove it.
> 
>  [ bp: Massage. ]
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Reviewed-by: Wei Yang <richard.weiyang@...il.com>
> Acked-by: Michal Hocko <mhocko@...e.com>
> Link: https://lkml.kernel.org/r/20200311011823.27740-1-bhe@redhat.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 abbdecb..0a14711 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();
>  }
>