Josh Poimboeuf b68b990706 objtool: Support conditional retpolines ... A Clang-built kernel is showing the following warning: arch/x86/kernel/platform-quirks.o: warning: objtool: x86_early_init_platform_quirks()+0x84: unreachable instruction That corresponds to this code: 7e: 0f 85 00 00 00 00 jne 84 <x86_early_init_platform_quirks+0x84> 80: R_X86_64_PC32 __x86_indirect_thunk_r11-0x4 84: c3 retq This is a conditional retpoline sibling call, which is now possible thanks to retpolines. Objtool hasn't seen that before. It's incorrectly interpreting the conditional jump as an unconditional dynamic jump. Reported-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/30d4c758b267ef487fb97e6ecb2f148ad007b554.1563413318.git.jpoimboe@redhat.com		2019-07-18 21:01:10 +02:00
..
arch/x86	objtool: Convert insn type to enum	2019-07-18 21:01:10 +02:00
Documentation
.gitignore
arch.h	objtool: Support conditional retpolines	2019-07-18 21:01:10 +02:00
Build
builtin-check.c
builtin-orc.c
builtin.h
cfi.h
check.c	objtool: Support conditional retpolines	2019-07-18 21:01:10 +02:00
check.h	objtool: Convert insn type to enum	2019-07-18 21:01:10 +02:00
elf.c	objtool: Refactor jump table code	2019-07-18 21:01:09 +02:00
elf.h	objtool: Support repeated uses of the same C jump table	2019-07-18 21:01:09 +02:00
Makefile
objtool.c
orc_dump.c
orc_gen.c
orc.h
special.c
special.h
sync-check.sh
warn.h