objtool/klp: Add test for symbols with no checksum entry of their own

.discard.sym_checksum is an array of { address, checksum } looked up by the
address a relocation points at, so the invariant is one entry per address.
calculate_checksums() skips zero-length symbols, aliases and cold parts to
keep it, and nothing checked that it does.

A duplicate entry is not a build failure.  It makes the lookup ambiguous,
and whichever checksum loses is never consulted again -- so a function
whose code changed can be read as unchanged and dropped from the patch.

The alias skip is verified the usual way: remove it and the test fails.
The other two are not isolated, and the test says so rather than implying
otherwise.  A zero-length symbol is excluded by several of the guards at
once -- its section has no data either -- so removing any one of them
changes nothing observable; the assertion stands as a check on the
behaviour, not on the line that produces it.  The cold-part skip needs a
compiler that splits functions and is not reached here at all.

Which of an aliased pair keeps the entry falls out of symbol table order,
so the test requires exactly one of the two rather than naming a winner --
as written first it named real_function and failed, because gcc kept the
alias.

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/20260916184351.2720310-48-song@kernel.org

0 files changed, 0 insertions, 0 deletions