When neither CONFIG_PCI nor CONFIG_IBMVIO is set/enabled, iommu.c has a build error. The fault injection code is not useful in that kernel config, so make the FAIL_IOMMU option depend on PCI || IBMVIO.
Prevents this build error (warning escalated to error): ../arch/powerpc/kernel/iommu.c:178:30: error: 'fail_iommu_bus_notifier' defined but not used [-Werror=unused-variable] 178 | static struct notifier_block fail_iommu_bus_notifier = { Fixes: d6b9a81b2a45 ("powerpc: IOMMU fault injection") Signed-off-by: Randy Dunlap <rdun...@infradead.org> Reported-by: kernel test robot <l...@intel.com> Suggested-by: Michael Ellerman <m...@ellerman.id.au> Cc: Michael Ellerman <m...@ellerman.id.au> Cc: linuxppc-...@lists.ozlabs.org Cc: Anton Blanchard <an...@samba.org> --- I was supposed to update this about one month ago, but then I lost some email and also took a break for a few weeks, then I remembered, so here it is. arch/powerpc/Kconfig.debug | 1 + 1 file changed, 1 insertion(+) --- lnx-512-rc1.orig/arch/powerpc/Kconfig.debug +++ lnx-512-rc1/arch/powerpc/Kconfig.debug @@ -353,6 +353,7 @@ config PPC_EARLY_DEBUG_CPM_ADDR config FAIL_IOMMU bool "Fault-injection capability for IOMMU" depends on FAULT_INJECTION + depends on PCI || IBMVIO help Provide fault-injection capability for IOMMU. Each device can be selectively enabled via the fail_iommu property.