Re: [PATCH v3 1/5] maple_tree: add mas_for_each_rev() helper

Suren Baghdasaryan
2024-10-16T05:33:29Z

On Tue, Oct 15, 2024 at 6:48 PM 'Liam R. Howlett' via kernel-team
<kernel-team@android.com> wrote:
>
> * Suren Baghdasaryan <surenb@google.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@Oracle.com>
> > Signed-off-by: Suren Baghdasaryan <surenb@google.com>
>
> I am now sure I added a R-B in a reply to this :)

Sorry, I missed it. Will add in the next version. Thanks!

>
> > ---
> > 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
> >
>
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