linux-kernel - Re: [PATCH 2/3] mm/hugetlb: Remove unnecessary if condition

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Message-ID: <20260116013940.71199-1-sj@kernel.org>
Date: Thu, 15 Jan 2026 17:39:39 -0800
From: SeongJae Park <sj@...nel.org>
To: Joshua Hahn <joshua.hahnjy@...il.com>
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	Muchun Song <muchun.song@...ux.dev>,
	Oscar Salvador <osalvador@...e.de>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/3] mm/hugetlb: Remove unnecessary if condition

On Thu, 15 Jan 2026 13:14:36 -0500 Joshua Hahn <joshua.hahnjy@...il.com> wrote:

> if (map_chg) is always true, since it is nested in another if statement
> which checks for it already. Remove the check and un-indent for readability.
> 
> if (unlikely(map_chg == MAP_CHG_NEEDED && retval == 0)) {
> 	...
> 
> 	if (map_chg) {
> 		...
> 	}
> }
> 
> No functional change intended.
> 
> Signed-off-by: Joshua Hahn <joshua.hahnjy@...il.com>

Reviewed-by: SeongJae Park <sj@...nel.org>

> ---
>  mm/hugetlb.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 88b9e997c9da..432a5054ca1d 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3019,13 +3019,11 @@ struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
>  
>  			rsv_adjust = hugepage_subpool_put_pages(spool, 1);
>  			hugetlb_acct_memory(h, -rsv_adjust);
> -			if (map_chg) {
> -				spin_lock_irq(&hugetlb_lock);
> -				hugetlb_cgroup_uncharge_folio_rsvd(
> -				    hstate_index(h), pages_per_huge_page(h),
> -				    folio);
> -				spin_unlock_irq(&hugetlb_lock);
> -			}
> +			spin_lock_irq(&hugetlb_lock);
> +			hugetlb_cgroup_uncharge_folio_rsvd(
> +			    hstate_index(h), pages_per_huge_page(h),
> +			    folio);

Nit.  Good chance to reduce one more line by putting 'folio' on the upper line?

> +			spin_unlock_irq(&hugetlb_lock);
>  		}
>  	}
>  
> -- 
> 2.47.3


Thanks,
SJ