linux-kernel - [PATCH] regmap: Use mas_walk() instead of mas

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Date:   Mon, 03 Apr 2023 20:59:44 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Liam.Howlett@...cle.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH] regmap: Use mas_walk() instead of mas_find()

Liam recommends using mas_walk() instead of mas_find() for our use case so
let's do that, it avoids some minor overhead associated with being able to
restart the operation which we don't need since we do a simple search.

Suggested-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/base/regmap/regcache-maple.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/base/regmap/regcache-maple.c b/drivers/base/regmap/regcache-maple.c
index 497cc708d277..5d1bc3691830 100644
--- a/drivers/base/regmap/regcache-maple.c
+++ b/drivers/base/regmap/regcache-maple.c
@@ -22,7 +22,9 @@ static int regcache_maple_read(struct regmap *map,
 
 	rcu_read_lock();
 
-	entry = mas_find(&mas, reg);
+	mas.index = reg;
+	mas.last = reg;
+	entry = mas_walk(&mas);
 	if (!entry) {
 		rcu_read_unlock();
 		return -ENOENT;
@@ -47,7 +49,9 @@ static int regcache_maple_write(struct regmap *map, unsigned int reg,
 
 	rcu_read_lock();
 
-	entry = mas_find(&mas, reg);
+	mas.index = reg;
+	mas.last = reg;
+	entry = mas_walk(&mas);
 	if (entry) {
 		entry[reg - mas.index] = val;
 		rcu_read_unlock();

---
base-commit: f033c26de5a5734625d2dd1dc196745fae186f1b
change-id: 20230403-regmap-maple-walk-fine-982bbd2dcfe5

Best regards,
-- 
Mark Brown <broonie@...nel.org>