* Peng Zhang <zhangpeng.00@xxxxxxxxxxxxx> [230509 08:39]:
>
>
> 在 2023/5/6 01:42, Liam R. Howlett 写道:
> > When there is a single entry tree (range of 0-0 pointing to an entry),
> > then ensure the limit is either 0-0 or 1-oo, depending on where the user
> > walks. Ensure the correct node setting as well; either MAS_ROOT or
> > MAS_NONE.
> >
> > Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
> > ---
> > lib/maple_tree.c | 21 +++++++++++----------
> > 1 file changed, 11 insertions(+), 10 deletions(-)
> >
> > diff --git a/lib/maple_tree.c b/lib/maple_tree.c
> > index f060c71965c0d..914399519cf54 100644
> > --- a/lib/maple_tree.c
> > +++ b/lib/maple_tree.c
> > @@ -5022,24 +5022,25 @@ void *mas_walk(struct ma_state *mas)
> > {
> > void *entry;
> > + if (mas_is_none(mas) || mas_is_paused(mas))
> if (mas_is_none(mas) || mas_is_paused(mas) || mas_is_ptr(mas))
> > + mas->node = MAS_START;
>
> Hi, Liam
> There is an issue that it cannot pass the user space test program
> with this patchset.
> I tested it based on 47cba14ce6fc4(linux-next/master).
>
> The reason is that mas_walk() does not handle the state that mas is
> root. The root cause is that mas_start() only handles the start state,
> and returns NULL for the root state. When encountering the root state,
> we can reset to start so that it is handled in mas_start().
Thanks. I'll have a look and adjust v3.
>
> log:
> BUG at check_state_handling:3076 (1)
> maple_tree(0x55d6a9838ca0) flags 1, height 0 root 0x1234500
> 0: 0x1234500
> Pass: 453406336 Run:453406337
> maple: ../../../lib/test_maple_tree.c:3076: check_state_handling: Assertion
> `0' failed.
> Aborted (core dumped)
> > retry:
> > entry = mas_state_walk(mas);
> > - if (mas_is_start(mas))
> > + if (mas_is_start(mas)) {
> > goto retry;
> > -
> > - if (mas_is_ptr(mas)) {
> > + } else if (mas_is_none(mas)) {
> > + mas->index = 0;
> > + mas->last = ULONG_MAX;
> > + } else if (mas_is_ptr(mas)) {
> > if (!mas->index) {
> > mas->last = 0;
> > - } else {
> > - mas->index = 1;
> > - mas->last = ULONG_MAX;
> > + return entry;
> > }
> > - return entry;
> > - }
> > - if (mas_is_none(mas)) {
> > - mas->index = 0;
> > + mas->index = 1;
> > mas->last = ULONG_MAX;
> > + mas->node = MAS_NONE;
> > + return NULL;
> > }
> > return entry;
