Re: [PATCH v2 2/8] hugetlb: no need to drop hugetlb_lock to call cma_release

[Michal Hocko]

On Mon 29-03-21 16:23:56, Mike Kravetz wrote:
> Now that cma_release is non-blocking and irq safe, there is no need to
> drop hugetlb_lock before calling.
> 
> Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>

Acked-by: Michal Hocko <mhocko@xxxxxxxx>

> ---
>  mm/hugetlb.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 3c3e4baa4156..1d62f0492e7b 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1353,14 +1353,8 @@ static void update_and_free_page(struct hstate *h, struct page *page)
>  	set_compound_page_dtor(page, NULL_COMPOUND_DTOR);
>  	set_page_refcounted(page);
>  	if (hstate_is_gigantic(h)) {
> -		/*
> -		 * Temporarily drop the hugetlb_lock, because
> -		 * we might block in free_gigantic_page().
> -		 */
> -		spin_unlock(&hugetlb_lock);
>  		destroy_compound_gigantic_page(page, huge_page_order(h));
>  		free_gigantic_page(page, huge_page_order(h));
> -		spin_lock(&hugetlb_lock);
>  	} else {
>  		__free_pages(page, huge_page_order(h));
>  	}
> -- 
> 2.30.2
> 

-- 
Michal Hocko
SUSE Labs