mm/damon: remove damon_operations->cleanup()

Patch series "mm/damon: cleanup kdamond, damon_call(), damos filter and
DAMON_MIN_REGION".

Do miscellaneous code cleanups for improving readability.  First three
patches cleanup kdamond termination process, by removing unused operation
set cleanup callback (patch 1) and moving damon_ctx specific resource
cleanups on kdamond termination to synchronization-easy place (patches 2
and 3).  Next two patches touch damon_call() infrastructure, by
refactoring kdamond_call() function to do less and simpler locking
operations (patch 4), and documenting when dealloc_on_free does work
(patch 5).  Final three patches rename things for clear uses of those. 
Those rename damos_filter_out() to be more explicit about the fact that it
is only for core-handled filters (patch 6), DAMON_MIN_REGION macro to be
more explicit it is not about number of regions but size of each region
(patch 7), and damon_ctx->min_sz_region to be different from
damos_access_patern->min_sz_region (patch 8), so that those are not
confusing and easy to grep.


This patch (of 8):

damon_operations->cleanup() was added for a case that an operation set
implementation requires additional cleanups.  But no such implementation
exists at the moment.  Remove it.

Link: https://lkml.kernel.org/r/20260117175256.82826-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20260117175256.82826-2-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

4 files changed, 0 insertions, 7 deletions

diff --git a/include/linux/damon.h b/include/linux/damon.h
index e6930d8574d3..bd4c76b126bd 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -607,7 +607,6 @@ enum damon_ops_id {
  * @apply_scheme:		Apply a DAMON-based operation scheme.
  * @target_valid:		Determine if the target is valid.
  * @cleanup_target:		Clean up each target before deallocation.
- * @cleanup:			Clean up the context.
  *
  * DAMON can be extended for various address spaces and usages.  For this,
  * users should register the low level operations for their target address
@@ -640,7 +639,6 @@ enum damon_ops_id {
  * @target_valid should check whether the target is still valid for the
  * monitoring.
  * @cleanup_target is called before the target will be deallocated.
- * @cleanup is called from @kdamond just before its termination.
  */
 struct damon_operations {
 	enum damon_ops_id id;
@@ -656,7 +654,6 @@ struct damon_operations {
 			struct damos *scheme, unsigned long *sz_filter_passed);
 	bool (*target_valid)(struct damon_target *t);
 	void (*cleanup_target)(struct damon_target *t);
-	void (*cleanup)(struct damon_ctx *context);
 };
 
 /*
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 81b998d32074..53514cb712cf 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -2859,8 +2859,6 @@ done:
 			damon_destroy_region(r, t);
 	}
 
-	if (ctx->ops.cleanup)
-		ctx->ops.cleanup(ctx);
 	kfree(ctx->regions_score_histogram);
 	kdamond_call(ctx, true);
 
diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 4c2c935d82d6..9bfe48826840 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -373,7 +373,6 @@ static int __init damon_pa_initcall(void)
 		.prepare_access_checks = damon_pa_prepare_access_checks,
 		.check_accesses = damon_pa_check_accesses,
 		.target_valid = NULL,
-		.cleanup = NULL,
 		.apply_scheme = damon_pa_apply_scheme,
 		.get_scheme_score = damon_pa_scheme_score,
 	};
diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 23ed738a0bd6..40c73adf1946 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -1014,7 +1014,6 @@ static int __init damon_va_initcall(void)
 		.check_accesses = damon_va_check_accesses,
 		.target_valid = damon_va_target_valid,
 		.cleanup_target = damon_va_cleanup_target,
-		.cleanup = NULL,
 		.apply_scheme = damon_va_apply_scheme,
 		.get_scheme_score = damon_va_scheme_score,
 	};