samples/damon/prcl: use damon_initialized()

damon_sample_prcl is assuming DAMON is ready to use in module_init time,
and uses its own hack to see if it is the time.  Use damon_initialized(),
which is a way for seeing if DAMON is ready to be used that is more
reliable and better to maintain instead of the hack.

Link: https://lkml.kernel.org/r/20250916033511.116366-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/samples/damon/prcl.c b/samples/damon/prcl.c
index 0226652f94d55e6f7f3cf63fac536e4473a19558..b7c50f2656ce72aeb1126b6b2d705c0c7dd4ccf0 100644 (file)
--- a/samples/damon/prcl.c
+++ b/samples/damon/prcl.c
@@ -122,8 +122,6 @@ static void damon_sample_prcl_stop(void)
        }
 }
 
-static bool init_called;
-
 static int damon_sample_prcl_enable_store(
                const char *val, const struct kernel_param *kp)
 {
@@ -137,7 +135,7 @@ static int damon_sample_prcl_enable_store(
        if (enabled == is_enabled)
                return 0;
 
-       if (!init_called)
+       if (!damon_initialized())
                return 0;
 
        if (enabled) {
@@ -154,7 +152,12 @@ static int __init damon_sample_prcl_init(void)
 {
        int err = 0;
 
-       init_called = true;
+       if (!damon_initialized()) {
+               if (enabled)
+                       enabled = false;
+               return -ENOMEM;
+       }
+
        if (enabled) {
                err = damon_sample_prcl_start();
                if (err)