[PATCH v2] regmap: Use mas_walk() instead of mas_find()

[PATCH v2] regmap: Use mas_walk() instead of mas_find()

[Mark Brown]

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@Oracle.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
Changes in v2:
- Don't set index and last again needlessly.
- Link to v1: https://lore.kernel.org/r/20230403-regmap-maple-walk-fine-v1-1-09512dd51e50@kernel.org
---
 drivers/base/regmap/regcache-maple.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/regmap/regcache-maple.c b/drivers/base/regmap/regcache-maple.c
index 497cc708d277..e48f5b0c96cb 100644
--- a/drivers/base/regmap/regcache-maple.c
+++ b/drivers/base/regmap/regcache-maple.c
@@ -22,7 +22,7 @@ static int regcache_maple_read(struct regmap *map,
 
 	rcu_read_lock();
 
-	entry = mas_find(&mas, reg);
+	entry = mas_walk(&mas);
 	if (!entry) {
 		rcu_read_unlock();
 		return -ENOENT;
@@ -47,7 +47,7 @@ static int regcache_maple_write(struct regmap *map, unsigned int reg,
 
 	rcu_read_lock();
 
-	entry = mas_find(&mas, 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@kernel.org>

Re: [PATCH v2] regmap: Use mas_walk() instead of mas_find()

[Mark Brown]

On Tue, 04 Apr 2023 20:42:28 +0100, Mark Brown wrote:
> 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.
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git for-next

Thanks!

[1/1] regmap: Use mas_walk() instead of mas_find()
      commit: fac79bad889bb167a37492181646992c8c48903b

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark