linux-kernel - Re: [PATCH 16/16] mm/page_alloc: fix obsolete comment in deferred_pfn

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Message-ID: <5ca3fb8f-2dbd-f6e1-8482-7e2fa4729b19@arm.com>
Date:   Tue, 13 Sep 2022 16:47:22 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Miaohe Lin <linmiaohe@...wei.com>, akpm@...ux-foundation.org
Cc:     david@...hat.com, osalvador@...e.de, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/16] mm/page_alloc: fix obsolete comment in
 deferred_pfn_valid()



On 9/9/22 14:54, Miaohe Lin wrote:
> There are no architectures that can have holes in the memory map within
> a pageblock since commit 859a85ddf90e ("mm: remove pfn_valid_within()
> and CONFIG_HOLES_IN_ZONE"). Update the corresponding comment.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>


> ---
>  mm/page_alloc.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 262e8972e019..4cc0232020d2 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1929,11 +1929,7 @@ static inline void __init pgdat_init_report_one_done(void)
>  /*
>   * Returns true if page needs to be initialized or freed to buddy allocator.
>   *
> - * First we check if pfn is valid on architectures where it is possible to have
> - * holes within pageblock_nr_pages. On systems where it is not possible, this
> - * function is optimized out.
> - *
> - * Then, we check if a current large page is valid by only checking the validity
> + * We check if a current large page is valid by only checking the validity
>   * of the head pfn.
>   */
>  static inline bool __init deferred_pfn_valid(unsigned long pfn)