[PATCH] maple_tree: root node could be handled by !p_slot too

[Liam R. Howlett]

* Wei Yang <richard.weiyang at gmail.com> [241013 10:42]:
> On Fri, Sep 13, 2024 at 10:17:07AM -0400, Liam R. Howlett wrote:
> >* Wei Yang <richard.weiyang at gmail.com> [240913 02:31]:
> >> For a root node, mte_parent_slot() return 0, this exactly fits the
> >> following !p_slot check.
> >
> >This sounds right, I will have to look deeper at it though.
> >
> 
> Hi, Liam
> 
> I guess you are back?

Yes.  I'll get to this soon.  I believe you have two sets (or three?) I
have to look at.

Thanks,
Liam

> 
> >Thanks,
> >Liam
> >
> >> 
> >> So we can remove the special handling for root node.
> >> 
> >> Signed-off-by: Wei Yang <richard.weiyang at gmail.com>
> >> CC: Liam R. Howlett <Liam.Howlett at Oracle.com>
> >> ---
> >>  lib/maple_tree.c | 4 +---
> >>  1 file changed, 1 insertion(+), 3 deletions(-)
> >> 
> >> diff --git a/lib/maple_tree.c b/lib/maple_tree.c
> >> index 85bd651e7770..b5dde94cc7a9 100644
> >> --- a/lib/maple_tree.c
> >> +++ b/lib/maple_tree.c
> >> @@ -2100,9 +2100,7 @@ static inline bool mas_prev_sibling(struct ma_state *mas)
> >>  {
> >>  	unsigned int p_slot = mte_parent_slot(mas->node);
> >>  
> >> -	if (mte_is_root(mas->node))
> >> -		return false;
> >> -
> >> +	/* For root node, p_slot is set to 0 by mte_parent_slot(). */
> >>  	if (!p_slot)
> >>  		return false;
> >>  
> >> -- 
> >> 2.34.1
> >> 
> 
> -- 
> Wei Yang
> Help you, Help me