klp diff needs entry boundaries for a special section: either an entsize,
or ANNOTATE_DATA_SPECIAL annotations naming where each entry starts.
.static_call_sites has no entsize, so the annotations are all there is --
and a patch can remove the last one in a translation unit while leaving the
section itself in place, so that only the patched side has lost them.
The section still has to be handled. Dropping it leaves the patched
function's static call unregistered; misreading its boundaries attaches the
entry to the wrong code. Neither is reported at build time.
Give the fixture a NO_ANNOTATE knob and assert the premise -- annotation
present in the original, absent in the patched object, section present in
both -- before asserting the result.
Fixed by commit 3de711fba7 ("objtool/klp: Fix create_fake_symbols()
skipping entsize-based sections"). Verified by making klp diff skip
.static_call_sites when cloning special sections: the test fails.
Assisted-by: Claude:claude-opus-4
Based-on-test-by: Joe Lawrence <joe.lawrence@redhat.com>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/20260916184351.2720310-55-song@kernel.org
794b162b37