[PATCH] mm/damon: support freeze kdamond

[Lin Ruifeng]

During suspend and resume, the data monitored by kdamond is
no longer meaningful. Meanwhile, since kdamond may involve
I/O operations, it is necessary to freeze it.

Signed-off-by: Lin Ruifeng <linruifeng4@xxxxxxxxxx>
---
 mm/damon/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 3e1890d64d06..5cd1f0aed66b 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -16,6 +16,7 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/string_choices.h>
+#include <linux/freezer.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/damon.h>
@@ -2753,6 +2754,7 @@ static int kdamond_fn(void *data)
 
 	complete(&ctx->kdamond_started);
 	kdamond_init_ctx(ctx);
+	set_freezable();
 
 	if (ctx->ops.init)
 		ctx->ops.init(ctx);
@@ -2774,6 +2776,8 @@ static int kdamond_fn(void *data)
 		unsigned long next_ops_update_sis = ctx->next_ops_update_sis;
 		unsigned long sample_interval = ctx->attrs.sample_interval;
 
+		try_to_freeze();
+
 		if (kdamond_wait_activation(ctx))
 			break;
 
-- 
2.43.0