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authorPaul E. McKenney <paulmck@kernel.org>2020-03-18 02:02:06 +0300
committerPaul E. McKenney <paulmck@kernel.org>2020-04-27 21:03:52 +0300
commit276c410448dbca357a2bc3539acfe04862e5f172 (patch)
tree5f25b125fb10b79997286884b3724f5415eb5b11 /init/init_task.c
parentb0afa0f056676ffe0a7213818f09d2460adbcc16 (diff)
downloadlinux-276c410448dbca357a2bc3539acfe04862e5f172.tar.xz
rcu-tasks: Split ->trc_reader_need_end
This commit splits ->trc_reader_need_end by using the rcu_special union. This change permits readers to check to see if a memory barrier is required without any added overhead in the common case where no such barrier is required. This commit also adds the read-side checking. Later commits will add the machinery to properly set the new ->trc_reader_special.b.need_mb field. This commit also makes rcu_read_unlock_trace_special() tolerate nested read-side critical sections within interrupt and NMI handlers. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'init/init_task.c')
-rw-r--r--init/init_task.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/init/init_task.c b/init/init_task.c
index e8b3740ee598..825972daec32 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -143,6 +143,7 @@ struct task_struct init_task
#endif
#ifdef CONFIG_TASKS_TRACE_RCU
.trc_reader_nesting = 0,
+ .trc_reader_special.s = 0,
.trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
#endif
#ifdef CONFIG_CPUSETS