linux-kernel - Re: [PATCH 3/3] mm/hugetlb: Assert hugetlb_lock in __hugetlb_cgroup_commit

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Date: Fri, 19 Apr 2024 08:03:08 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: Peter Xu <peterx@...hat.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	David Hildenbrand <david@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Muchun Song <muchun.song@...ux.dev>, David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 3/3] mm/hugetlb: Assert hugetlb_lock in __hugetlb_cgroup_commit_charge

On Wed, Apr 17, 2024 at 2:18 PM Peter Xu <peterx@...hat.com> wrote:
>
> This is similar to __hugetlb_cgroup_uncharge_folio() where it relies on
> holding hugetlb_lock.  Add the similar assertion like the other one, since
> it looks like such things may help some day.
>
> Signed-off-by: Peter Xu <peterx@...hat.com>

Reviewed-by: Mina Almasry <almasrymina@...gle.com>

> ---
>  mm/hugetlb_cgroup.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
> index aa4486bd3904..e20339a346b9 100644
> --- a/mm/hugetlb_cgroup.c
> +++ b/mm/hugetlb_cgroup.c
> @@ -308,7 +308,7 @@ static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
>  {
>         if (hugetlb_cgroup_disabled() || !h_cg)
>                 return;
> -
> +       lockdep_assert_held(&hugetlb_lock);

Maybe also remove the comment on the top of the function:

/* Should be called with hugetlb_lock held */

Now that the function asserts, the comment seems redundant, but up to you.

>         __set_hugetlb_cgroup(folio, h_cg, rsvd);
>         if (!rsvd) {
>                 unsigned long usage =
> --
> 2.44.0
>


-- 
Thanks,
Mina