[RFC PATCH 6/9] mm/damon/sysfs: use damon_call() for update_schemes_effective_quotas

[SeongJae Park <sj@xxxxxxxxxx>]

DAMON sysfs interface uses damon_callback with its own synchronization
facility to handle update_schemes_effective_quotas command.  But
damon_call() can support the use case without the additional
synchronizations.  Convert the code to use damon_call() instead.

Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
 mm/damon/sysfs.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 24070f36fa7c..978de4305f2b 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1327,20 +1327,18 @@ static int damon_sysfs_commit_schemes_quota_goals(void *data)
 /*
  * damon_sysfs_upd_schemes_effective_quotas() - Update schemes effective quotas
  * sysfs files.
- * @kdamond:	The kobject wrapper that associated to the kdamond thread.
+ * @data:	The kobject wrapper that associated to the kdamond thread.
  *
  * This function reads the schemes' effective quotas of specific kdamond and
  * update the related values for sysfs files.  This function should be called
  * from DAMON callbacks while holding ``damon_syfs_lock``, to safely access the
  * DAMON contexts-internal data and DAMON sysfs variables.
  */
-static int damon_sysfs_upd_schemes_effective_quotas(
-		struct damon_sysfs_kdamond *kdamond)
+static int damon_sysfs_upd_schemes_effective_quotas(void *data)
 {
+	struct damon_sysfs_kdamond *kdamond = data;
 	struct damon_ctx *ctx = kdamond->damon_ctx;
 
-	if (!ctx)
-		return -EINVAL;
 	damos_sysfs_update_effective_quotas(
 			kdamond->contexts->contexts_arr[0]->schemes, ctx);
 	return 0;
@@ -1400,9 +1398,6 @@ static int damon_sysfs_cmd_request_callback(struct damon_ctx *c, bool active,
 			damon_sysfs_schemes_regions_updating = false;
 		}
 		break;
-	case DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS:
-		err = damon_sysfs_upd_schemes_effective_quotas(kdamond);
-		break;
 	default:
 		break;
 	}
@@ -1550,6 +1545,10 @@ static int damon_sysfs_handle_cmd(enum damon_sysfs_cmd cmd,
 	case DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS:
 		return damon_sysfs_schemes_clear_regions(
 			kdamond->contexts->contexts_arr[0]->schemes);
+	case DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS:
+		return damon_sysfs_damon_call(
+				damon_sysfs_upd_schemes_effective_quotas,
+				kdamond);
 	default:
 		break;
 	}
-- 
2.39.5