x86/Xen: mark xen_setup_gdt() __init
Its only caller is __init, so to avoid section mismatch warnings when a compiler decides to not inline the function marke this function so as well. Take the opportunity and also make the function actually use its argument: The sole caller passes in zero anyway. Signed-off-by: NJan Beulich <jbeulich@suse.com> Reviewed-by: NJuergen Gross <jgross@suse.com> Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
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