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Use unsigned arithmetic for operations on the mask word in the foreach_apic() macro, to avoid relying on undefined behaviour when shifting into the sign bit. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>