* Upper bits of the flags in the contention_data are used to identify
* some well-known locks which do not have symbols (non-global locks).
*/
-#define LCD_F_MMAP_LOCK (1U << 31)
+#define LCD_F_MMAP_LOCK (1U << 31)
+#define LCD_F_SIGHAND_LOCK (1U << 30)
struct contention_data {
u64 total_time;