Split up the MA_STATE() macro such that components using the maple tree
can easily inherit from struct ma_state and build custom tree walk
macros to hide their internals from users.
Example:
struct sample_iterator {
struct ma_state mas;
struct sample_mgr *mgr;
};
\#define SAMPLE_ITERATOR(name, __mgr, start) \
struct sample_iterator name = { \
.mas = MA_STATE_INIT(&(__mgr)->mt, start, 0), \
.mgr = __mgr, \
}
\#define sample_iter_for_each_range(it__, entry__, end__) \
mas_for_each(&(it__).mas, entry__, end__)
--
struct sample *sample;
SAMPLE_ITERATOR(si, min);
sample_iter_for_each_range(&si, sample, max) {
frob(mgr, sample);
}
Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
---
include/linux/maple_tree.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index 1fadb5f5978b..87d55334f1c2 100644
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -423,8 +423,8 @@ struct ma_wr_state {
#define MA_ERROR(err) \
((struct maple_enode *)(((unsigned long)err << 2) | 2UL))
-#define MA_STATE(name, mt, first, end) \
- struct ma_state name = { \
+#define MA_STATE_INIT(mt, first, end) \
+ { \
.tree = mt, \
.index = first, \
.last = end, \
@@ -435,6 +435,9 @@ struct ma_wr_state {
.mas_flags = 0, \
}
+#define MA_STATE(name, mt, first, end) \
+ struct ma_state name = MA_STATE_INIT(mt, first, end)
+
#define MA_WR_STATE(name, ma_state, wr_entry) \
struct ma_wr_state name = { \
.mas = ma_state, \
--
2.39.2
