linux-kernel - [PATCH 03/12] mm/damon/sysfs: use damon_commit

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Date: Tue, 18 Jun 2024 11:18:00 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 03/12] mm/damon/sysfs: use damon_commit_ctx()

DAMON_SYSFS manually manipulates DAMON context structs for online
parameters update.  Since the struct contains not only input parameters
but also internal status and operation results, it is not that simple.
Indeed, we found and fixed a few bugs in the code.  Now DAMON core layer
provides a function for the usage, namely damon_commit_ctx().  Replace
the manual manipulation logic with the function.  The core layer
function could have its own bugs, but this change removes a source of
bugs.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/sysfs.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 6fee383bc0c5..0f9fe18beb40 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1345,6 +1345,9 @@ static int damon_sysfs_apply_inputs(struct damon_ctx *ctx,
 	return damon_sysfs_set_schemes(ctx, sys_ctx->schemes);
 }
 
+static struct damon_ctx *damon_sysfs_build_ctx(
+		struct damon_sysfs_context *sys_ctx);
+
 /*
  * damon_sysfs_commit_input() - Commit user inputs to a running kdamond.
  * @kdamond:	The kobject wrapper for the associated kdamond.
@@ -1353,14 +1356,22 @@ static int damon_sysfs_apply_inputs(struct damon_ctx *ctx,
  */
 static int damon_sysfs_commit_input(struct damon_sysfs_kdamond *kdamond)
 {
+	struct damon_ctx *param_ctx;
+	int err;
+
 	if (!damon_sysfs_kdamond_running(kdamond))
 		return -EINVAL;
 	/* TODO: Support multiple contexts per kdamond */
 	if (kdamond->contexts->nr != 1)
 		return -EINVAL;
 
-	return damon_sysfs_apply_inputs(kdamond->damon_ctx,
-			kdamond->contexts->contexts_arr[0]);
+	param_ctx = damon_sysfs_build_ctx(kdamond->contexts->contexts_arr[0]);
+	if (IS_ERR(param_ctx))
+		return PTR_ERR(param_ctx);
+	err = damon_commit_ctx(kdamond->damon_ctx, param_ctx);
+	damon_sysfs_destroy_targets(param_ctx);
+	damon_destroy_ctx(param_ctx);
+	return err;
 }
 
 static int damon_sysfs_commit_schemes_quota_goals(
-- 
2.39.2