linux-kernel - [PATCH 8/8] selftests/damon/_chk_dependency: get debugfs mount point from /proc/mounts

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Message-Id: <20240207203134.69976-9-sj@kernel.org>
Date: Wed,  7 Feb 2024 12:31:34 -0800
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 8/8] selftests/damon/_chk_dependency: get debugfs mount point from /proc/mounts

DAMON debugfs selftests dependency checker assumes debugfs would be
mounted at /sys/kernel/debug.  That would be ok for many cases, but some
systems might mounted the file system on some different places.  Parse
the real mount point using /proc/mounts file.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 tools/testing/selftests/damon/_chk_dependency.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/damon/_chk_dependency.sh b/tools/testing/selftests/damon/_chk_dependency.sh
index 350f8c2b071d..dda3a87dc00a 100644
--- a/tools/testing/selftests/damon/_chk_dependency.sh
+++ b/tools/testing/selftests/damon/_chk_dependency.sh
@@ -4,7 +4,14 @@
 # Kselftest framework requirement - SKIP code is 4.
 ksft_skip=4
 
-DBGFS=/sys/kernel/debug/damon
+DBGFS=$(grep debugfs /proc/mounts --max-count 1 | awk '{print $2}')
+if [ "$DBGFS" = "" ]
+then
+	echo "debugfs not mounted"
+	exit $ksft_skip
+fi
+
+DBGFS+="/damon"
 
 if [ $EUID -ne 0 ];
 then
-- 
2.39.2