linux-kernel - Re: [PATCH] mm: hugetlb_vmemmap: fix CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT

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Date:   Fri, 27 May 2022 11:54:05 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Muchun Song <songmuchun@...edance.com>, akpm@...ux-foundation.org,
        mike.kravetz@...cle.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: hugetlb_vmemmap: fix
 CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON

On 5/27/22 10:19, Muchun Song wrote:
> The following:
> 
>   commit 47010c040dec ("mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP*")
> 
> forgot to update CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON used in
> vmemmap_optimize_mode to CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON.
> The result is we cannot enable hugetlb_optimize_vmemmap at boot time
> when we configure CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON. Fix
> it.
> 
> Reported-by: Vlastimil Babka <vbabka@...e.cz>
> Fixes: 47010c040dec ("mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP*")
> Signed-off-by: Muchun Song <songmuchun@...edance.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/hugetlb_vmemmap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
> index fcd9f7872064..1089ea8a9c98 100644
> --- a/mm/hugetlb_vmemmap.c
> +++ b/mm/hugetlb_vmemmap.c
> @@ -33,7 +33,7 @@ DEFINE_STATIC_KEY_MAYBE(CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON,
>  EXPORT_SYMBOL(hugetlb_optimize_vmemmap_key);
>  
>  static enum vmemmap_optimize_mode vmemmap_optimize_mode =
> -	IS_ENABLED(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON);
> +	IS_ENABLED(CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON);
>  
>  static void vmemmap_optimize_mode_switch(enum vmemmap_optimize_mode to)
>  {