The patch titled Subject: maple_tree: add mas_is_active() to detect in-tree walks has been added to the -mm mm-hotfixes-unstable branch. Its filename is maple_tree-add-mas_active-to-detect-in-tree-walks.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: "Liam R. Howlett" Liam.Howlett@oracle.com Subject: maple_tree: add mas_is_active() to detect in-tree walks Date: Thu, 21 Sep 2023 14:12:35 -0400

Patch series "maple_tree: Fix mas_prev() state regression".

Pedro Falcato contacted me on IRC with an mprotect regression which was bisected back to the iterator changes for maple tree. Root cause analysis showed the mas_prev() running off the end of the VMA space (previous from 0) followed by mas_find(), would skip the first value.

This patchset introduces maple state underflow/overflow so the sequence of calls on the maple state will return what the user expects.

This patch (of 2):

Instead of constantly checking each possibility of the maple state, create a fast path that will skip over checking unlikely states.

Link: https://lkml.kernel.org/r/20230921181236.509072-1-Liam.Howlett@oracle.com Link: https://lkml.kernel.org/r/20230921181236.509072-2-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Liam.Howlett@oracle.com Cc: Pedro Falcato pedro.falcato@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

include/linux/maple_tree.h | 9 +++++++++ 1 file changed, 9 insertions(+)

--- a/include/linux/maple_tree.h~maple_tree-add-mas_active-to-detect-in-tree-walks +++ a/include/linux/maple_tree.h @@ -511,6 +511,15 @@ static inline bool mas_is_paused(const s return mas->node == MAS_PAUSE; }

+/* Check if the mas is pointing to a node or not */ +static inline bool mas_is_active(struct ma_state *mas) +{ + if ((unsigned long)mas->node >= MAPLE_RESERVED_RANGE) + return true; + + return false; +} + /** * mas_reset() - Reset a Maple Tree operation state. * @mas: Maple Tree operation state. _

Patches currently in -mm which might be from Liam.Howlett@oracle.com are

maple_tree-add-mas_active-to-detect-in-tree-walks.patch maple_tree-add-mas_underflow-and-mas_overflow-states.patch