mm/damon/core: remove damon_callback

All damon_callback usages are replicated by damon_call() and damos_walk().
Time to say goodbye.  Remove damon_callback.

Link: https://lkml.kernel.org/r/20250712195016.151108-15-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 1 insertions, 30 deletions

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 8c765e36623a..f13664c62ddd 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -629,34 +629,6 @@ struct damon_operations {
 	void (*cleanup)(struct damon_ctx *context);
 };
 
-/**
- * struct damon_callback - Monitoring events notification callbacks.
- *
- * @after_wmarks_check:	Called after each schemes' watermarks check.
- * @after_aggregation:	Called after each aggregation.
- * @before_terminate:	Called before terminating the monitoring.
- *
- * The monitoring thread (&damon_ctx.kdamond) calls @before_terminate just
- * before finishing the monitoring.
- *
- * The monitoring thread calls @after_wmarks_check after each DAMON-based
- * operation schemes' watermarks check.  If users need to make changes to the
- * attributes of the monitoring context while it's deactivated due to the
- * watermarks, this is the good place to do.
- *
- * The monitoring thread calls @after_aggregation for each of the aggregation
- * intervals.  Therefore, users can safely access the monitoring results
- * without additional protection.  For the reason, users are recommended to use
- * these callback for the accesses to the results.
- *
- * If any callback returns non-zero, monitoring stops.
- */
-struct damon_callback {
-	int (*after_wmarks_check)(struct damon_ctx *context);
-	int (*after_aggregation)(struct damon_ctx *context);
-	void (*before_terminate)(struct damon_ctx *context);
-};
-
 /*
  * struct damon_call_control - Control damon_call().
  *
@@ -727,7 +699,7 @@ struct damon_intervals_goal {
  * ``mmap()`` calls from the application, in case of virtual memory monitoring)
  * and applies the changes for each @ops_update_interval.  All time intervals
  * are in micro-seconds.  Please refer to &struct damon_operations and &struct
- * damon_callback for more detail.
+ * damon_call_control for more detail.
  */
 struct damon_attrs {
 	unsigned long sample_interval;
@@ -816,7 +788,6 @@ struct damon_ctx {
 	struct mutex kdamond_lock;
 
 	struct damon_operations ops;
-	struct damon_callback callback;
 
 	struct list_head adaptive_targets;
 	struct list_head schemes;