linux-kernel - Re: [PATCH v2] mm: sysctl: fix missing numa_stat when !CONFIG_HUGETLB

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Date:   Thu, 9 Jun 2022 13:43:24 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     mcgrof@...nel.org, keescook@...omium.org, yzaikin@...gle.com,
        akpm@...ux-foundation.org, vbabka@...e.cz,
        mgorman@...hsingularity.net, peterz@...radead.org,
        dhowells@...hat.com, willy@...radead.org, Liam.Howlett@...cle.com,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] mm: sysctl: fix missing numa_stat when
 !CONFIG_HUGETLB_PAGE

On Thu 09-06-22 18:40:32, Muchun Song wrote:
> "numa_stat" should not be included in the scope of CONFIG_HUGETLB_PAGE, if
> CONFIG_HUGETLB_PAGE is not configured even if CONFIG_NUMA is configured,
> "numa_stat" is missed form /proc. Move it out of CONFIG_HUGETLB_PAGE to
> fix it.
> 
> Fixes: 4518085e127d ("mm, sysctl: make NUMA stats configurable")
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> Cc: <stable@...r.kernel.org>

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

Thanks!

> ---
> v2:
>  - Simplify the fix, thanks to Michal.
> 
>  kernel/sysctl.c | 20 +++++++++++---------
>  1 file changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 50a2c29efc94..485d2b1bc873 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -2091,6 +2091,17 @@ static struct ctl_table vm_table[] = {
>  		.extra1		= SYSCTL_ZERO,
>  		.extra2		= SYSCTL_TWO_HUNDRED,
>  	},
> +#ifdef CONFIG_NUMA
> +	{
> +		.procname	= "numa_stat",
> +		.data		= &sysctl_vm_numa_stat,
> +		.maxlen		= sizeof(int),
> +		.mode		= 0644,
> +		.proc_handler	= sysctl_vm_numa_stat_handler,
> +		.extra1		= SYSCTL_ZERO,
> +		.extra2		= SYSCTL_ONE,
> +	},
> +#endif
>  #ifdef CONFIG_HUGETLB_PAGE
>  	{
>  		.procname	= "nr_hugepages",
> @@ -2107,15 +2118,6 @@ static struct ctl_table vm_table[] = {
>  		.mode           = 0644,
>  		.proc_handler   = &hugetlb_mempolicy_sysctl_handler,
>  	},
> -	{
> -		.procname		= "numa_stat",
> -		.data			= &sysctl_vm_numa_stat,
> -		.maxlen			= sizeof(int),
> -		.mode			= 0644,
> -		.proc_handler	= sysctl_vm_numa_stat_handler,
> -		.extra1			= SYSCTL_ZERO,
> -		.extra2			= SYSCTL_ONE,
> -	},
>  #endif
>  	 {
>  		.procname	= "hugetlb_shm_group",
> -- 
> 2.11.0

-- 
Michal Hocko
SUSE Labs