rcu: Add explicit barrier() to __rcu_read_unlock()

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Because preemptible RCU's __rcu_read_unlock() is an external function,
the rough equivalent of an implicit barrier() is inserted by the compiler.
Except that there is a direct call to __rcu_read_unlock() in that same
file, and compilers are getting to the point where they might choose to
inline the fastpath of the __rcu_read_unlock() function.

This commit therefore adds an explicit barrier() to the very beginning
of __rcu_read_unlock().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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This commit is contained in:

Paul E. McKenney 2021-02-26 11:25:29 -08:00

parent e589c7c723

commit 7e937220af

1 changed files with 2 additions and 1 deletions

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kernel/rcu/tree_plugin.h

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