linux-toradex.git/tools/objtool/tests/generic/test-checksum-value.sh, branch master Linux kernel for Apalis and Colibri modules objtool/klp: Add test for recorded checksum values 2026-09-21T09:12:06+00:00 Song Liu song@kernel.org 2026-09-16T18:43:28+00:00 a5f001a475d157184c038f8dcab1e7690f501eab Whether klp diff treats a function as changed is decided by its checksum, and until now nothing looked at one. A test asserting only that the right functions were cloned cannot tell a correct checksum from one that happens to differ. Asserts both directions -- the changed function's checksum moves, the untouched one's does not -- and that checksumming identical input twice gives the same answer, since otherwise every rebuild reports spurious changes. 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/20260916184351.2720310-36-song@kernel.org 
Whether klp diff treats a function as changed is decided by its checksum,
and until now nothing looked at one.  A test asserting only that the right
functions were cloned cannot tell a correct checksum from one that happens
to differ.

Asserts both directions -- the changed function's checksum moves, the
untouched one's does not -- and that checksumming identical input twice
gives the same answer, since otherwise every rebuild reports spurious
changes.

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/20260916184351.2720310-36-song@kernel.org