On Tue, Oct 20, 2020 at 01:52:17PM -0500, Josh Poimboeuf wrote: > > arch/x86/lib/retpoline.S: > > __x86_retpoline_rdi()+0x10: return with modified stack frame > > __x86_retpoline_rdi()+0x0: stack state mismatch: cfa1=7+32 cfa2=7+8 > > __x86_retpoline_rdi()+0x0: stack state mismatch: cfa1=7+32 cfa2=-1+0 > > Is this with upstream? I thought we fixed that with > UNWIND_HINT_RET_OFFSET. I can't reproduce this one either; but I do get different warnings: gcc (Debian 10.2.0-13) 10.2.0, x86_64-defconfig: defconfig-build/vmlinux.o: warning: objtool: __x86_indirect_thunk_rax() falls through to next function __x86_retpoline_rax() defconfig-build/vmlinux.o: warning: objtool: .altinstr_replacement+0x1063: (branch) defconfig-build/vmlinux.o: warning: objtool: __x86_indirect_thunk_rax()+0x0: (alt) defconfig-build/vmlinux.o: warning: objtool: __x86_indirect_thunk_rax()+0x0: <=== (sym) (for every single register, not just rax) Which is daft as well, because the retpoline.o run is clean. It also doesn't make sense because __x86_retpoline_rax isn't in fact STT_FUNC, so WTH ?!
