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Howlett [230512 11:54]: > * Peng Zhang [230509 08:39]: > >=20 > >=20 > > =E5=9C=A8 2023/5/6 01:42, Liam R. Howlett =E5=86=99=E9=81=93: > > > 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 u= ser > > > walks. Ensure the correct node setting as well; either MAS_ROOT or > > > MAS_NONE. > > >=20 > > > Signed-off-by: Liam R. Howlett > > > --- > > > lib/maple_tree.c | 21 +++++++++++---------- > > > 1 file changed, 11 insertions(+), 10 deletions(-) > > >=20 > > > 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 =3D MAS_START; > >=20 > > 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). > >=20 > > 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(). >=20 > Thanks. I'll have a look and adjust v3. This was introduced with the fix for the race condition between v1 and v2. It is probably best to reset to MAS_START instead of the potential stale data. >=20 > >=20 > > 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: Asser= tion > > `0' failed. > > Aborted (core dumped) > > > retry: > > > entry =3D 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 =3D 0; > > > + mas->last =3D ULONG_MAX; > > > + } else if (mas_is_ptr(mas)) { > > > if (!mas->index) { > > > mas->last =3D 0; > > > - } else { > > > - mas->index =3D 1; > > > - mas->last =3D ULONG_MAX; > > > + return entry; > > > } > > > - return entry; > > > - } > > > - if (mas_is_none(mas)) { > > > - mas->index =3D 0; > > > + mas->index =3D 1; > > > mas->last =3D ULONG_MAX; > > > + mas->node =3D MAS_NONE; > > > + return NULL; > > > } > > > return entry;