I only saw these warnings once, they are either very rare, or were introduced recently:
arch/x86/kvm/vmx.o: warning: objtool: .altinstr_replacement+0x0: unreachable instruction arch/x86/kvm/svm.o: warning: objtool: .altinstr_replacement+0x6e: unreachable instruction I see this with gcc-4.6 though gcc-7, but not with gcc-4.3. The configuration file that triggered it is https://pastebin.com/aMn45GYP I managed to trace the problem down to the CC_HAVE_ASM_GOTO macro, without that, we don't run into the problem. Arnd
