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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-10-14 19:39:43 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-10-18 10:27:02 -0700 |
| commit | e6c86c513f440bec5f1046539c7e3c6c653842da (patch) | |
| tree | b74b9661a63b5b201ae8d3f0072d05e2bcbd3798 /kernel/rcu | |
| parent | 62c69e89e81bfbdb9a87ae3e0599dcc6aacf786b (diff) | |
| download | linux-e6c86c513f440bec5f1046539c7e3c6c653842da.tar.bz2 | |
rcu-tasks: Provide rcu_trace_implies_rcu_gp()
As an accident of implementation, an RCU Tasks Trace grace period also
acts as an RCU grace period. However, this could change at any time.
This commit therefore creates an rcu_trace_implies_rcu_gp() that currently
returns true to codify this accident. Code relying on this accident
must call this function to verify that this accident is still happening.
Reported-by: Hou Tao <houtao@huaweicloud.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Link: https://lore.kernel.org/r/20221014113946.965131-2-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tasks.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index f5bf6fb430da..9435e5a7b53e 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1535,6 +1535,8 @@ static void rcu_tasks_trace_postscan(struct list_head *hop) { // Wait for late-stage exiting tasks to finish exiting. // These might have passed the call to exit_tasks_rcu_finish(). + + // If you remove the following line, update rcu_trace_implies_rcu_gp()!!! synchronize_rcu(); // Any tasks that exit after this point will set // TRC_NEED_QS_CHECKED in ->trc_reader_special.b.need_qs. |