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Message-ID: <20230109165455.647400-1-Liam.Howlett@oracle.com>
Date: Mon, 9 Jan 2023 16:55:42 +0000
From: Liam Howlett <liam.howlett@...cle.com>
To: "linux-mm@...ck.org" <linux-mm@...ck.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
"maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>
CC: Liam Howlett <liam.howlett@...cle.com>,
SeongJae Park <sj@...nel.org>
Subject: [PATCH] maple_tree: Fix handle of invalidated state in
mas_wr_store_setup()
If an invalidated maple state is encountered during write, reset the
maple state to MAS_START. This will result in a re-walk of the tree to
the correct location for the write.
Link: https://lore.kernel.org/all/20230107020126.1627-1-sj@kernel.org/
Reported-by: SeongJae Park <sj@...nel.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
lib/maple_tree.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 14cff87cf058..59c4879ac714 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5620,6 +5620,9 @@ static inline void mte_destroy_walk(struct maple_enode *enode,
static void mas_wr_store_setup(struct ma_wr_state *wr_mas)
{
+ if (unlikely(mas_is_paused(wr_mas->mas)))
+ mas_reset(wr_mas->mas);
+
if (!mas_is_start(wr_mas->mas)) {
if (mas_is_none(wr_mas->mas)) {
mas_reset(wr_mas->mas);
--
2.35.1
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