tree ca659907076c6118e627427989f70fed4f3674a5
parent 51d9ed4527228c985fd840f1c1e8bd0f01bcfdb6
author Paul E. McKenney <paulmck@kernel.org> 1693492229 -0700
committer Paul E. McKenney <paulmck@kernel.org> 1694698068 -0700

locktorture: Prevent spinloop from escaping lock-held diagnostics

The lock_torture_writer() function uses lock_is_write_held to communicate
that the current task write-holds the lock.  Except that nothing currently
prevents the compiler from moving this wirte past the lock-hold delay,
which makes it less probable that other code will detect the fact
that the lock is in fact held.  This commit therefore adds barrier()
invocations to constrain the compiler.

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