linux-kernel - Re: [PATCH 06/10] maple_tree: Wrap the replace operation with an inline function.

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Date:   Mon, 15 May 2023 13:07:22 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Peng Zhang <zhangpeng.00@...edance.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org
Subject: Re: [PATCH 06/10] maple_tree: Wrap the replace operation with an
 inline function.

* Peng Zhang <zhangpeng.00@...edance.com> [230515 09:18]:
> To make mas_wr_modify() cleaner, wrap the replace operation with an
> inline function.

mas_wr_modify() is already pretty small.  Is there any reason you want
this in its own function besides it looking cleaner?

> 
> Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>
> ---
>  lib/maple_tree.c | 21 +++++++++++++++------
>  1 file changed, 15 insertions(+), 6 deletions(-)
> 
> diff --git a/lib/maple_tree.c b/lib/maple_tree.c
> index 4c649d75a4923..ce695adc670ec 100644
> --- a/lib/maple_tree.c
> +++ b/lib/maple_tree.c
> @@ -4288,6 +4288,19 @@ static inline void mas_wr_extend_null(struct ma_wr_state *wr_mas)
>  	}
>  }
>  
> +static inline bool mas_wr_replace(struct ma_wr_state *wr_mas)
> +{
> +	struct ma_state *mas = wr_mas->mas;
> +
> +	if (wr_mas->r_min == mas->index && wr_mas->r_max == mas->last) {
> +		rcu_assign_pointer(wr_mas->slots[mas->offset], wr_mas->entry);
> +		if (!!wr_mas->entry ^ !!wr_mas->content)
> +			mas_update_gap(mas);
> +		return true;
> +	}
> +	return false;
> +}
> +
>  static inline bool mas_wr_append(struct ma_wr_state *wr_mas)
>  {
>  	unsigned char end = wr_mas->node_end;
> @@ -4347,13 +4360,9 @@ static inline void mas_wr_modify(struct ma_wr_state *wr_mas)
>  	unsigned char node_size;
>  	struct ma_state *mas = wr_mas->mas;
>  
> -	/* Direct replacement */
> -	if (wr_mas->r_min == mas->index && wr_mas->r_max == mas->last) {
> -		rcu_assign_pointer(wr_mas->slots[mas->offset], wr_mas->entry);
> -		if (!!wr_mas->entry ^ !!wr_mas->content)
> -			mas_update_gap(mas);
> +	/* Attempt to direct replace */
> +	if (mas_wr_replace(wr_mas))
>  		return;
> -	}
>  
>  	/* Attempt to append */
>  	node_slots = mt_slots[wr_mas->type];
> -- 
> 2.20.1
>