linux-kernel - Re: [PATCH v3 1/5] mm/migrate.c: make putback_movable

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Message-ID: <f1fbfe7e-74ac-e60c-b984-ab4c03445d07@redhat.com>
Date:   Thu, 25 Mar 2021 14:17:15 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Miaohe Lin <linmiaohe@...wei.com>, akpm@...ux-foundation.org
Cc:     jglisse@...hat.com, shy828301@...il.com, aquini@...hat.com,
        apopple@...dia.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v3 1/5] mm/migrate.c: make putback_movable_page() static

On 25.03.21 14:15, Miaohe Lin wrote:
> The putback_movable_page() is just called by putback_movable_pages() and
> we know the page is locked and both PageMovable() and PageIsolated() is
> checked right before calling putback_movable_page(). So we make it static
> and remove all the 3 VM_BUG_ON_PAGE().
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>   include/linux/migrate.h | 1 -
>   mm/migrate.c            | 7 +------
>   2 files changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index fdf65f23acec..1d8095069b1c 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -44,7 +44,6 @@ extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
>   		unsigned long private, enum migrate_mode mode, int reason);
>   extern struct page *alloc_migration_target(struct page *page, unsigned long private);
>   extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
> -extern void putback_movable_page(struct page *page);
>   
>   extern void migrate_prep(void);
>   extern void migrate_prep_local(void);
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 47df0df8f21a..61e7f848b554 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -140,15 +140,10 @@ int isolate_movable_page(struct page *page, isolate_mode_t mode)
>   	return -EBUSY;
>   }
>   
> -/* It should be called on page which is PG_movable */
> -void putback_movable_page(struct page *page)
> +static void putback_movable_page(struct page *page)
>   {
>   	struct address_space *mapping;
>   
> -	VM_BUG_ON_PAGE(!PageLocked(page), page);
> -	VM_BUG_ON_PAGE(!PageMovable(page), page);
> -	VM_BUG_ON_PAGE(!PageIsolated(page), page);
> -
>   	mapping = page_mapping(page);
>   	mapping->a_ops->putback_page(page);
>   	__ClearPageIsolated(page);
> 

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

-- 
Thanks,

David / dhildenb