linux-kernel - Re: [PATCH 2/8] mm/percpu: use list_first_entry_or_null in pcpu_reclaim

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Message-ID: <Y1bC6zkpmEx+XzRo@fedora>
Date:   Mon, 24 Oct 2022 09:52:59 -0700
From:   Dennis Zhou <dennis@...nel.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: Re: [PATCH 2/8] mm/percpu: use list_first_entry_or_null in
 pcpu_reclaim_populated()

On Mon, Oct 24, 2022 at 04:14:29PM +0800, Baoquan He wrote:
> To replace list_empty()/list_first_entry() pair to simplify code.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
>  mm/percpu.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/percpu.c b/mm/percpu.c
> index 26d8cd2ca323..a3fde4ac03a4 100644
> --- a/mm/percpu.c
> +++ b/mm/percpu.c
> @@ -2143,9 +2143,9 @@ static void pcpu_reclaim_populated(void)
>  	 * other accessor is the free path which only returns area back to the
>  	 * allocator not touching the populated bitmap.
>  	 */
> -	while (!list_empty(&pcpu_chunk_lists[pcpu_to_depopulate_slot])) {
> -		chunk = list_first_entry(&pcpu_chunk_lists[pcpu_to_depopulate_slot],
> -					 struct pcpu_chunk, list);
> +	while (chunk = list_first_entry_or_null(
> +			&pcpu_chunk_lists[pcpu_to_depopulate_slot],
> +			struct pcpu_chunk, list)) {
>  		WARN_ON(chunk->immutable);
>  
>  		/*
> -- 
> 2.34.1
> 

With added parenthesis,

Acked-by: Dennis Zhou <dennis@...nel.org>

Thanks,
Dennis