Gentoo's Bugzilla –
Attachment 560854 Details for
Bug 675334sys-kernel/gentoo-sources-4.14.x / sys-kernel/ck-sources-4.14.x - arch/powerpc/kernel/kvm.c: In function `kvm_guest_init': ./arch/powerpc/include/asm/epapr_hcalls.h:470:42: error: `in' may be used uninitialized in this function [-Werror=maybe-uninitialize