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A cloned data section has to keep its sh_addralign. Plenty of kernel data
is aligned for correctness rather than speed -- per-CPU variables, anything
touched by an aligned vector move, structures padded to own a cacheline --
and a clone that lands under-aligned either faults on first use or silently
shares a line it was laid out to avoid. Neither shows up until the patch
is loaded on hardware that cares.
The fixture's data is new in the patched build, so klp diff has to clone it
rather than reference the kernel's copy, and it asserts that premise before
asserting the result.
Commit 2f2600decb30 ("objtool/klp: fix data alignment in __clone_symbol()")
cannot be reverted to check this -- the revert is a no-op against the
current code, which has been rewritten since. Verified instead by forcing
the clone's alignment to 1, which the test reports as "alignment 1,
expected 64".
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/20260916184351.2720310-54-song@kernel.org
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