objtool/klp: Test text annotations on alternative replacements

The kernel annotates instructions inside an ALTERNATIVE's replacement
wherever objtool has to be told something about them -- a retpoline-safe
indirect branch, a deliberately absent ENDBR.  klp diff dropped those
annotations, for two reasons: replacement code has no real symbol, so the
NOTYPE fake symbol objtool invents for it was not recognised as worth
keeping a reference to, and .discard.annotate_insn was processed before
.altinstructions, so the replacement it named had no clone yet.

Nothing fails at build time when the annotation goes missing.  It surfaces
later as objtool warning about, or rejecting, the very code the annotation
was there to explain.

The fixture keeps the replacement label global, as empty_alternative.c
does, so the relocations name it instead of .altinstr_replacement plus an
addend -- which klp diff rejects outright.  The label is still NOTYPE,
which is the property under test.  The test asserts the relocation as well
as the section, since an entry whose relocation was dropped would otherwise
pass.

Verified by reverting commit 62a7a01fde87 ("objtool/klp: Fix extraction of
text annotations for alternatives"): the output has no
.discard.annotate_insn at all and the test fails, under both gcc and clang.

Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Assisted-by: Claude:claude-opus-5
Link: https://patch.msgid.link/20260916184351.2720310-46-song@kernel.org

0 files changed, 0 insertions, 0 deletions