mm/damon/core: print kdamond start log in debug mode only

mainline inclusion
from mainline-5.16
commit 704571f9
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4GVMK
CVE: NA

-------------------------------------------------
Logging of kdamond startup is using 'pr_info()' unnecessarily.  This
makes it to use 'pr_debug()' instead.

Link: https://lkml.kernel.org/r/20210917123958.3819-6-sj@kernel.orgSigned-off-by: NSeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: SeongJae Park <sjpark@amazon.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 704571f9)
Signed-off-by: NYue Zou <zouyue3@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

mm/damon/core.c

@@ -653,7 +653,7 @@ static int kdamond_fn(void *data)
 	unsigned long sz_limit = 0;
 
 	mutex_lock(&ctx->kdamond_lock);
-	pr_info("kdamond (%d) starts\n", ctx->kdamond->pid);
+	pr_debug("kdamond (%d) starts\n", ctx->kdamond->pid);
 	mutex_unlock(&ctx->kdamond_lock);
 
 	if (ctx->primitive.init)