softlockup: remove timestamp checking from hung_task

Impact: saves sizeof(long) bytes per task_struct

By guaranteeing that sysctl_hung_task_timeout_secs have elapsed between
tasklist scans we can avoid using timestamps.

Signed-off-by: Mandeep Singh Baines <msb@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 2a2811c6239d..e0d723fea9f5 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1241,7 +1241,6 @@ struct task_struct {
 #endif
 #ifdef CONFIG_DETECT_HUNG_TASK
 /* hung task detection */
-        unsigned long last_switch_timestamp;
         unsigned long last_switch_count;
 #endif
 /* CPU-specific state of this task */