Re: [PATCH 2/3] maple_tree: use mas_safe_pivot() to get the pivot range

["Liam R. Howlett" <Liam.Howlett@oracle.com>]

nack

* Wei Yang <richard.weiyang@gmail.com> [240830 20:11]:
> Before modifying data, we need to walk the tree to locate the
> maple_node. Also we get the range boundary at offset/offset_end.
> 
> For the upper boundary at offset, we have defined function
> mas_safe_pivot() to get it. Let's leverage it.
> 
> Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
> ---
>  lib/maple_tree.c | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/lib/maple_tree.c b/lib/maple_tree.c
> index 85668246f944..17533c246749 100644
> --- a/lib/maple_tree.c
> +++ b/lib/maple_tree.c
> @@ -2185,7 +2185,7 @@ static inline void mas_wr_node_walk(struct ma_wr_state *wr_mas)
>  	while (offset < count && mas->index > wr_mas->pivots[offset])
>  		offset++;
>  
> -	wr_mas->r_max = offset < count ? wr_mas->pivots[offset] : mas->max;
> +	wr_mas->r_max = mas_safe_pivot(mas, wr_mas->pivots, offset, wr_mas->type);
>  	wr_mas->r_min = mas_safe_min(mas, wr_mas->pivots, offset);
>  	wr_mas->offset_end = mas->offset = offset;
>  }
> @@ -3987,11 +3987,9 @@ static inline void mas_wr_extend_null(struct ma_wr_state *wr_mas)
>  		    (mas->end != wr_mas->offset_end) &&
>  		    !wr_mas->slots[wr_mas->offset_end + 1]) {
>  			wr_mas->offset_end++;
> -			if (wr_mas->offset_end == mas->end)
> -				mas->last = mas->max;
> -			else
> -				mas->last = wr_mas->pivots[wr_mas->offset_end];
> -			wr_mas->end_piv = mas->last;
> +			wr_mas->end_piv = mas->last =
> +				mas_safe_pivot(mas, wr_mas->pivots,
> +					wr_mas->offset_end, wr_mas->type);
>  		}
>  	}
>  
> @@ -4016,10 +4014,8 @@ static inline void mas_wr_end_piv(struct ma_wr_state *wr_mas)
>  	       (wr_mas->mas->last > wr_mas->pivots[wr_mas->offset_end]))
>  		wr_mas->offset_end++;
>  
> -	if (wr_mas->offset_end < wr_mas->mas->end)
> -		wr_mas->end_piv = wr_mas->pivots[wr_mas->offset_end];
> -	else
> -		wr_mas->end_piv = wr_mas->mas->max;
> +	wr_mas->end_piv = mas_safe_pivot(wr_mas->mas, wr_mas->pivots,
> +				wr_mas->offset_end, wr_mas->type);
>  
>  	if (!wr_mas->entry)
>  		mas_wr_extend_null(wr_mas);
> -- 
> 2.34.1
> 
>