linux-kernel - Re: [PATCH v3 1/5] maple_tree: add mas_for_each

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Message-ID: <o3jak2i7ohhxi53xlthv7yy3oop62qpfscel36szn4sctg67ip@ctrntnrcauav>
Date: Tue, 15 Oct 2024 21:48:03 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: akpm@...ux-foundation.org, kent.overstreet@...ux.dev, corbet@....net,
        arnd@...db.de, mcgrof@...nel.org, rppt@...nel.org, paulmck@...nel.org,
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Subject: Re: [PATCH v3 1/5] maple_tree: add mas_for_each_rev() helper

* Suren Baghdasaryan <surenb@...gle.com> [241014 16:36]:
> Add mas_for_each_rev() function to iterate maple tree nodes in reverse
> order.
> 
> Suggested-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>

I am now sure I added a R-B in a reply to this :)

> ---
>  include/linux/maple_tree.h | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
> index c2c11004085e..e7e2caa1a95a 100644
> --- a/include/linux/maple_tree.h
> +++ b/include/linux/maple_tree.h
> @@ -592,6 +592,20 @@ static __always_inline void mas_reset(struct ma_state *mas)
>  #define mas_for_each(__mas, __entry, __max) \
>  	while (((__entry) = mas_find((__mas), (__max))) != NULL)
>  
> +/**
> + * mas_for_each_rev() - Iterate over a range of the maple tree in reverse order.
> + * @__mas: Maple Tree operation state (maple_state)
> + * @__entry: Entry retrieved from the tree
> + * @__min: minimum index to retrieve from the tree
> + *
> + * When returned, mas->index and mas->last will hold the entire range for the
> + * entry.
> + *
> + * Note: may return the zero entry.
> + */
> +#define mas_for_each_rev(__mas, __entry, __min) \
> +	while (((__entry) = mas_find_rev((__mas), (__min))) != NULL)
> +
>  #ifdef CONFIG_DEBUG_MAPLE_TREE
>  enum mt_dump_format {
>  	mt_dump_dec,
> -- 
> 2.47.0.rc1.288.g06298d1525-goog
>