MAX_MSI_VECTORS
static unsigned long um_pci_msi_used[BITS_TO_LONGS(MAX_MSI_VECTORS)];
bit = find_first_zero_bit(um_pci_msi_used, MAX_MSI_VECTORS);
if (bit >= MAX_MSI_VECTORS) {
.size = MAX_MSI_VECTORS,
DECLARE_BITMAP(used, MAX_MSI_VECTORS);