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Drops a race where 2 threads could spot a positive value and both proceed to dec to -1, without reporting anything. Signed-off-by: Mateusz Guzik <mjguzik@gmail.com> Message-Id: <20230811194814.1612336-1-mjguzik@gmail.com> Signed-off-by: Christian Brauner <brauner@kernel.org>