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| author |   Paul E. McKenney <paulmck@kernel.org> | 2020-03-17 16:02:06 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-04-27 11:03:52 -0700 |
| commit | 276c410448dbca357a2bc3539acfe04862e5f172 (patch) | |
| tree | 5f25b125fb10b79997286884b3724f5415eb5b11 /kernel/fork.c | |
| parent | rcu-tasks: Provide boot parameter to delay IPIs until late in grace period (diff) | |
| download | wireguard-linux-276c410448dbca357a2bc3539acfe04862e5f172.tar.xz wireguard-linux-276c410448dbca357a2bc3539acfe04862e5f172.zip | |
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 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 72e9396235b4..96eb4b535ced 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1685,6 +1685,7 @@ static inline void rcu_copy_process(struct task_struct *p) #endif /* #ifdef CONFIG_TASKS_RCU */ #ifdef CONFIG_TASKS_TRACE_RCU p->trc_reader_nesting = 0; + p->trc_reader_special.s = 0; INIT_LIST_HEAD(&p->trc_holdout_list); #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */ } |