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In order to protect against the header being included multiple times on the same compilation unit. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/20200901083326.21264-2-roger.pau@citrix.com Signed-off-by: Juergen Gross <jgross@suse.com>