linux-kernel - Re: [PATCH v3 1/2] mm: pass page count and reserved to __init_single

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Date:   Thu, 28 Sep 2023 08:30:39 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Yajun Deng <yajun.deng@...ux.dev>
Cc:     akpm@...ux-foundation.org, mike.kravetz@...cle.com,
        muchun.song@...ux.dev, willy@...radead.org, david@...hat.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] mm: pass page count and reserved to
 __init_single_page

On Tue, Sep 26, 2023 at 10:33:40AM +0800, Yajun Deng wrote:
> When we init a single page, we need to mark this page reserved if it
> does. And some pages may not need to set page count, such as compound
> pages.
> 
> Introduce enum init_page_flags, the caller init page count and mark page
> reserved by passing INIT_PAGE_COUNT and INIT_PAGE_RESERVED.
> 
> Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
> ---
> v3: Introduce enum init_page_flags.
> v2: Introduce INIT_PAGE_COUNT and INIT_PAGE_RESERVED.
> v1: https://lore.kernel.org/all/20230922070923.355656-1-yajun.deng@linux.dev/
> ---
>  mm/hugetlb.c  |  2 +-
>  mm/internal.h |  8 +++++++-
>  mm/mm_init.c  | 31 +++++++++++++++++--------------
>  3 files changed, 25 insertions(+), 16 deletions(-)
> 
> diff --git a/mm/mm_init.c b/mm/mm_init.c
> index 06a72c223bce..07fe7e489769 100644
> --- a/mm/mm_init.c
> +++ b/mm/mm_init.c
> @@ -1041,7 +1043,7 @@ static void __ref memmap_init_compound(struct page *head,
>  	for (pfn = head_pfn + 1; pfn < end_pfn; pfn++) {
>  		struct page *page = pfn_to_page(pfn);
>  
> -		__init_zone_device_page(page, pfn, zone_idx, nid, pgmap);
> +		__init_zone_device_page(page, pfn, zone_idx, nid, pgmap, 0);

I think the first patch should not contain any functional changes, but only
add the flags parameter to __init_single_page().

>  		prep_compound_tail(head, pfn - head_pfn);
>  		set_page_count(page, 0);
>  

-- 
Sincerely yours,
Mike.