rcu-tasks: Split ->trc_reader_need_end

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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>

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This commit is contained in:

Paul E. McKenney 2020-03-17 16:02:06 -07:00

parent b0afa0f056

commit 276c410448

5 changed files with 31 additions and 19 deletions

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11

include/linux/rcupdate_trace.h

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4

include/linux/sched.h

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1

init/init_task.c

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1

kernel/fork.c

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33

kernel/rcu/tasks.h

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