Documentation/litmus-tests: Demonstrate unordered failing cmpxchg

This commit adds four litmus tests showing that a failing cmpxchg()
operation is unordered unless followed by an smp_mb__after_atomic()
operation.

Suggested-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Cc: Alan Stern <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: David Howells <[email protected]>
Cc: Jade Alglave <[email protected]>
Cc: Luc Maranget <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Akira Yokosawa <[email protected]>
Cc: Daniel Lustig <[email protected]>
Cc: Joel Fernandes <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Acked-by: Andrea Parri <[email protected]>

0 files changed, 0 insertions, 0 deletions