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d9800a96cb
xa_cmpxchg() was a little too magic in turning ZERO entries into NULL, and would leave the entry set to the ZERO entry instead of releasing it for future use. After careful review of existing users of xa_cmpxchg(), change the semantics so that it does not translate either incoming argument from NULL into ZERO entries. Add several tests to the test-suite to make sure this problem doesn't come back. Reported-by: Jason Gunthorpe <jgg@ziepe.ca> Change-Id: I846221b090e9e1ea678c17f9363f6f0ad2fd2f91 Signed-off-by: Matthew Wilcox <willy@infradead.org>