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Commit64a1b95bb9("genirq: Restrict export of irq_to_desc()") removed the export of irq_to_desc() unless powerpc KVM is being built, because there is still a use of irq_to_desc() in modular code there. However it used: #ifdef CONFIG_KVM_BOOK3S_64_HV Which doesn't work when that symbol is =m, leading to a build failure: ERROR: modpost: "irq_to_desc" [arch/powerpc/kvm/kvm-hv.ko] undefined! Fix it by checking for the definedness of the correct symbol which is CONFIG_KVM_BOOK3S_64_HV_MODULE. Fixes:64a1b95bb9("genirq: Restrict export of irq_to_desc()") Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>