linux-kernel - Re: [PATCH 6/8] maple_tree: change return type of mas_commit_b

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Date:   Tue, 20 Dec 2022 15:03:36 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Vernon Yang <vernon2gm@...il.com>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/8] maple_tree: change return type of mas_commit_b_node()

* Vernon Yang <vernon2gm@...il.com> [221220 09:26]:
> The return value of mas_commit_b_node() function represents whether
> the submit b_node is successful, and can only be false and true, so
> the return value type is bool is more appropriate and for better
> readability.
> 
> Signed-off-by: Vernon Yang <vernon2gm@...il.com>
> ---
>  lib/maple_tree.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/maple_tree.c b/lib/maple_tree.c
> index b3a215dd961e..e7dde4a1d6cb 100644
> --- a/lib/maple_tree.c
> +++ b/lib/maple_tree.c
> @@ -3578,7 +3578,7 @@ static inline bool mas_reuse_node(struct ma_wr_state *wr_mas,
>   * @b_node: The maple big node
>   * @end: The end of the data.
>   */
> -static inline int mas_commit_b_node(struct ma_wr_state *wr_mas,
> +static inline bool mas_commit_b_node(struct ma_wr_state *wr_mas,
>  			    struct maple_big_node *b_node, unsigned char end)

mas_commit_b_node() can also return the ints from mas_split() and
mas_rebalance().  I'm fine with changing the return, but it seems odd to
only half-change it?

Initially I had a different intention for the return type of int, but it
seems the return isn't used at all from this function.  We should
just change mas_commit_b_node(), mas_split(), and mas_rebalance() to
return type void if we're going to clean it up.

>  {
>  	struct maple_node *node;
> @@ -3598,7 +3598,7 @@ static inline int mas_commit_b_node(struct ma_wr_state *wr_mas,
>  
>  	mas_node_count(wr_mas->mas, 1);
>  	if (mas_is_err(wr_mas->mas))
> -		return 0;
> +		return false;
>  
>  	node = mas_pop_node(wr_mas->mas);
>  	node->parent = mas_mn(wr_mas->mas)->parent;
> @@ -3607,7 +3607,7 @@ static inline int mas_commit_b_node(struct ma_wr_state *wr_mas,
>  	mas_replace(wr_mas->mas, false);
>  reuse_node:
>  	mas_update_gap(wr_mas->mas);
> -	return 1;
> +	return true;
>  }
>  
>  /*
> -- 
> 2.34.1
> 
>