On Mon, Mar 21, 2022 at 01:55:49PM +0100, Peter Zijlstra wrote: > On Mon, Mar 21, 2022 at 02:03:27PM +1100, Stephen Rothwell wrote: > > Hi all, > > > > After merging the tip tree, today's linux-next build (x864 allmodconfig) > > produced these new warnings: > > > > vmlinux.o: warning: objtool: arch_rethook_prepare()+0x55: relocation to !ENDBR: arch_rethook_trampoline+0x0 > > vmlinux.o: warning: objtool: arch_rethook_trampoline_callback()+0x3e: relocation to !ENDBR: arch_rethook_trampoline+0x0 > > vmlinux.o: warning: objtool: unwind_next_frame()+0x93e: relocation to !ENDBR: arch_rethook_trampoline+0x0 > > vmlinux.o: warning: objtool: unwind_next_frame()+0x5f2: relocation to !ENDBR: arch_rethook_trampoline+0x0 > > vmlinux.o: warning: objtool: unwind_next_frame()+0x4a7: relocation to !ENDBR: arch_rethook_trampoline+0x0 > > vmlinux.o: warning: objtool: __rethook_find_ret_addr()+0x81: relocation to !ENDBR: arch_rethook_trampoline+0x0 > > vmlinux.o: warning: objtool: __rethook_find_ret_addr()+0x90: relocation to !ENDBR: arch_rethook_trampoline+0x0 > > vmlinux.o: warning: objtool: rethook_trampoline_handler()+0x8c: relocation to !ENDBR: arch_rethook_trampoline+0x0 > > vmlinux.o: warning: objtool: rethook_trampoline_handler()+0x9b: relocation to !ENDBR: arch_rethook_trampoline+0x0 > > Hurmph, lemme go figure out where that code comes from, I've not seen > those. Ahh, something tracing. I'll go do some patches on top of it. Also, folks, I'm thinking we should start to move to __fexit__, if CET SHSTK ever wants to come to kernel land return trampolines will insta-stop working. Hjl, do you think we could get -mfexit to go along with -mfentry ?
