linux-kernel - Re: [PATCH 03/11] maple_tree: Add some helper functions

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Date:   Fri, 11 Aug 2023 13:28:21 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Peng Zhang <zhangpeng.00@...edance.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        mathieu.desnoyers@...icios.com, npiggin@...il.com, corbet@....net,
        akpm@...ux-foundation.org, michael.christie@...cle.com,
        peterz@...radead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-doc@...r.kernel.org, avagin@...il.com, surenb@...gle.com,
        brauner@...nel.org
Subject: Re: [PATCH 03/11] maple_tree: Add some helper functions

* Peng Zhang <zhangpeng.00@...edance.com> [230731 07:45]:
> 
> 
> 在 2023/7/26 23:08, Matthew Wilcox 写道:
> > On Wed, Jul 26, 2023 at 11:02:52AM -0400, Liam R. Howlett wrote:
> > > * Peng Zhang <zhangpeng.00@...edance.com> [230726 04:10]:
> > > >   static inline
> > > > -enum maple_type mas_parent_type(struct ma_state *mas, struct maple_enode *enode)
> > > > +enum maple_type ma_parent_type(struct maple_tree *mt, struct maple_node *node)
> > > 
> > > I was trying to keep ma_* prefix to mean the first argument is
> > > maple_node and mt_* to mean maple_tree.  I wasn't entirely successful
> > > with this and I do see why you want to use ma_, but maybe reverse the
> > > arguments here?
> > 
> > I think your first idea is better.  Usually we prefer to order the
> > arguments by "containing thing" to "contained thing".  So always use
> > (struct address_space *, struct folio *), for example.  Or (struct
> > mm_struct *, struct vm_area_struct *).
> There are disagreements here, so how to decide? But I don't know if the
> new version still has this helper.

Please keep the maple tree as the first argument and use:
mt_parent_type as the name.. if you still need it.