drivers/pci/pci-acpi.c:1164:1: warning: symbol 'pci_acpi_companion_lookup_key' was not declared. Should it be static? Reported-by: kernel test robot <lkp(a)intel.com&gt; Signed-off-by: kernel test robot <lkp(a)intel.com&gt; --- pci-acpi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 535f43034a073..c8718aeafae5d 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -1161,7 +1161,7 @@ void acpi_pci_remove_bus(struct pci_bus *bus) /* ACPI bus type */ -DEFINE_STATIC_KEY_FALSE(pci_acpi_companion_lookup_key); +static DEFINE_STATIC_KEY_FALSE(pci_acpi_companion_lookup_key); static DEFINE_MUTEX(pci_acpi_companion_lookup_mtx); static struct acpi_device *(*pci_acpi_find_companion_hook)(struct pci_dev *);