[PATCH v17 34/47] dept: make dept stop from working on debug_locks_off()

Byungchul Park
2025-10-02T08:14:03Z

For many reasons, debug_locks_off() is called to stop lock debuging
feature e.g. on panic(). dept should also stop it in the conditions.

Signed-off-by: Byungchul Park <byungchul@sk.com>
---
include/linux/dept.h | 2 ++
kernel/dependency/dept.c | 6 ++++++
lib/debug_locks.c | 2 ++
3 files changed, 10 insertions(+)

diff --git a/include/linux/dept.h b/include/linux/dept.h
index 8b4d97fc4627..b164f74e86e5 100644
--- a/include/linux/dept.h
+++ b/include/linux/dept.h
@@ -390,6 +390,7 @@ struct dept_ext_wgen {
unsigned int wgen;
};

+extern void dept_stop_emerg(void);
extern void dept_on(void);
extern void dept_off(void);
extern void dept_init(void);
@@ -442,6 +443,7 @@ struct dept_ext_wgen { };

#define DEPT_MAP_INITIALIZER(n, k) { }

+#define dept_stop_emerg() do { } while (0)
#define dept_on() do { } while (0)
#define dept_off() do { } while (0)
#define dept_init() do { } while (0)
diff --git a/kernel/dependency/dept.c b/kernel/dependency/dept.c
index a0eb4b108de0..1de61306418b 100644
--- a/kernel/dependency/dept.c
+++ b/kernel/dependency/dept.c
@@ -187,6 +187,12 @@ static void dept_unlock(void)
arch_spin_unlock(&dept_spin);
}

+void dept_stop_emerg(void)
+{
+ WRITE_ONCE(dept_stop, 1);
+}
+EXPORT_SYMBOL_GPL(dept_stop_emerg);
+
enum bfs_ret {
BFS_CONTINUE,
BFS_DONE,
diff --git a/lib/debug_locks.c b/lib/debug_locks.c
index a75ee30b77cb..14a965914a8f 100644
--- a/lib/debug_locks.c
+++ b/lib/debug_locks.c
@@ -38,6 +38,8 @@ EXPORT_SYMBOL_GPL(debug_locks_silent);
*/
int debug_locks_off(void)
{
+ dept_stop_emerg();
+
if (debug_locks && __debug_locks_off()) {
if (!debug_locks_silent) {
console_verbose();
--
2.17.1