linux-kernel - Re: [PATCH 1/6] mm/page_alloc.c: remove meaningless VM_BUG_ON() in pindex_to

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Date:   Tue, 31 Aug 2021 16:05:59 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Miaohe Lin <linmiaohe@...wei.com>, akpm@...ux-foundation.org
Cc:     vbabka@...e.cz, sfr@...b.auug.org.au, peterz@...radead.org,
        mgorman@...hsingularity.net, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] mm/page_alloc.c: remove meaningless VM_BUG_ON() in
 pindex_to_order()

On 30.08.21 16:10, Miaohe Lin wrote:
> It's meaningless to VM_BUG_ON() order != pageblock_order just after
> setting order to pageblock_order. Remove it.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>   mm/page_alloc.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 91edb930b8ab..dbb3338d9287 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -677,10 +677,8 @@ static inline int pindex_to_order(unsigned int pindex)
>   	int order = pindex / MIGRATE_PCPTYPES;
>   
>   #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> -	if (order > PAGE_ALLOC_COSTLY_ORDER) {
> +	if (order > PAGE_ALLOC_COSTLY_ORDER)
>   		order = pageblock_order;
> -		VM_BUG_ON(order != pageblock_order);
> -	}
>   #else
>   	VM_BUG_ON(order > PAGE_ALLOC_COSTLY_ORDER);
>   #endif
> 

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb