maple_tree: make ma_wr_states reliable for reuse in spanning store

mas_extend_spanning_null() was not modifying the range min and range max
of the resulting store operation.  The result was that the maple write
state no longer matched what the write was doing.  This was not an issue
as the values were previously not used, but to make the ma_wr_state usable
in future changes, the range min/max stored in the ma_wr_state for left
and right need to be consistent with the operation.

Link: https://lkml.kernel.org/r/20260130205935.2559335-7-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andrew Ballance <andrewjballance@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christian Kujau <lists@nerdbynature.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index fb14ce4a49c3c17fe249c13c54b39154c9851fb8..ab14876bebf7cf8330ff6a02bc49aa049f907ecb 100644 (file)
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -3319,6 +3319,7 @@ static inline void mas_extend_spanning_null(struct ma_wr_state *l_wr_mas,
                        l_mas->index = l_mas->min;
 
                l_mas->offset = l_slot - 1;
+               l_wr_mas->r_min = l_mas->index;
        }
 
        if (!r_wr_mas->content) {
@@ -3331,6 +3332,7 @@ static inline void mas_extend_spanning_null(struct ma_wr_state *l_wr_mas,
                r_mas->last = mas_safe_pivot(r_mas, r_wr_mas->pivots,
                                             r_wr_mas->type, r_mas->offset + 1);
                r_mas->offset++;
+               r_wr_mas->r_max = r_mas->last;
        }
 }