Re: [PATCH v3 1/2] mm: pass page count and reserved to __init_single_page

[Mike Rapoport <rppt@kernel.org>]

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@linux.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.