objtool: Support retpoline jump detection for vmlinux.o
authorJosh Poimboeuf <jpoimboe@redhat.com>
Thu, 21 Jan 2021 21:29:20 +0000 (15:29 -0600)
committerJosh Poimboeuf <jpoimboe@redhat.com>
Tue, 26 Jan 2021 17:11:59 +0000 (11:11 -0600)
commit31a7424bc58063a8e0466c3c10f31a52ec2be4f6
treee7ba59289de541468c5f9fd5331a3d8b75107a06
parent34ca59e109bdf69704c33b8eeffaa4c9f71076e5
objtool: Support retpoline jump detection for vmlinux.o

Objtool converts direct retpoline jumps to type INSN_JUMP_DYNAMIC, since
that's what they are semantically.

That conversion doesn't work in vmlinux.o validation because the
indirect thunk function is present in the object, so the intra-object
jump check succeeds before the retpoline jump check gets a chance.

Rearrange the checks: check for a retpoline jump before checking for an
intra-object jump.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/4302893513770dde68ddc22a9d6a2a04aca491dd.1611263461.git.jpoimboe@redhat.com
tools/objtool/check.c