linux-kernel - Re: [PATCH v2 1/2] mm/memory_hotplug: remove reset_node_managed_pages() in hotadd_init

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Message-ID: <ZIBbkULCQ8qEYrMG@dhcp22.suse.cz>
Date:   Wed, 7 Jun 2023 12:27:29 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Haifeng Xu <haifeng.xu@...pee.com>
Cc:     david@...hat.com, rppt@...nel.org, osalvador@...e.de,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] mm/memory_hotplug: remove
 reset_node_managed_pages() in hotadd_init_pgdat()

On Wed 07-06-23 02:45:48, Haifeng Xu wrote:
> managed pages has already been set to 0 in free_area_init_core_hotplug(),
> via zone_init_internals() on each zone. It's pointless to reset again.
> 
> Furthermore, reset_node_managed_pages() no longer needs to be exposed
> outside of mm/memblock.c. Remove declaration in include/linux/memblock.h
> and define it as static.
> 
> In addtion to this, the only caller of reset_node_managed_pages() is
> reset_all_zones_managed_pages(), which is annotated with __init, so it
> should be safe to also mark reset_node_managed_pages() as __init.
> 
> Signed-off-by: Haifeng Xu <haifeng.xu@...pee.com>
> Suggested-by: David Hildenbrand <david@...hat.com>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
> v2:
> - unexport reset_node_managed_pages()
> - mark reset_node_managed_pages() as __init
> - update commit message
> ---
>  include/linux/memblock.h | 1 -
>  mm/memblock.c            | 2 +-
>  mm/memory_hotplug.c      | 1 -
>  3 files changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index f82ee3fac1cd..f71ff9f0ec81 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -128,7 +128,6 @@ int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
>  
>  void memblock_free_all(void);
>  void memblock_free(void *ptr, size_t size);
> -void reset_node_managed_pages(pg_data_t *pgdat);
>  void reset_all_zones_managed_pages(void);
>  
>  /* Low level functions */
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 3feafea06ab2..da4264528e1e 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -2122,7 +2122,7 @@ static unsigned long __init free_low_memory_core_early(void)
>  
>  static int reset_managed_pages_done __initdata;
>  
> -void reset_node_managed_pages(pg_data_t *pgdat)
> +static void __init reset_node_managed_pages(pg_data_t *pgdat)
>  {
>  	struct zone *z;
>  
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 8e0fa209d533..65e385f34679 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1210,7 +1210,6 @@ static pg_data_t __ref *hotadd_init_pgdat(int nid)
>  	 * online_pages() and offline_pages().
>  	 * TODO: should be in free_area_init_core_hotplug?
>  	 */
> -	reset_node_managed_pages(pgdat);
>  	reset_node_present_pages(pgdat);
>  
>  	return pgdat;
> -- 
> 2.25.1

-- 
Michal Hocko
SUSE Labs