en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/objtool/Documentation/klp-write-tests.txt#5b6dca02b3e2254d2fd5706d76d7ab4610a67296 Merge tag 'objtool-core-2026-10-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull objtool updates from Ingo Molnar: - Add unit test suite for objtool klp functionality and known failure modes (by Song Liu and Puranjay Mohan, with fixes by Joe Lawrence)* tag 'objtool-core-2026-10-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (58 commits) objtool/klp: Add test for ThinLTO symbols sharing a demangled name objtool/klp: Add test for Clang switch jump tables objtool/klp: Add test for UBSAN metadata in an unchanged function objtool/klp: Add test for absolute and __ADDRESSABLE symbols objtool/klp: Add test for a patch which strips a data annotation objtool/klp: Add test for the alignment of cloned data sections objtool/klp: Add test for alternative replacement code in checksums objtool/klp: Add test for instruction operand checksums objtool/klp: Add test for a static call introduced by the patch objtool/klp: Add test for tracepoint and pr_debug static branch keys objtool/klp: Add test for a static branch introduced by the patch objtool/klp: Add test for symbols with no checksum entry of their own objtool/klp: Add test for data object checksums objtool/klp: Test text annotations on alternative replacements objtool/klp: Test a hand-built livepatch module's static call keys objtool/klp: Test rejection of a file-local static branch key objtool/klp: Add test for symbols whose linkage the patch changes objtool/klp: Add test for kCFI prefix symbols and traps objtool/klp: Add test for __bug_table, __ex_table and __mcount_loc extraction objtool/klp: Add test for static locals which must not be correlated ... List of files: /linux/tools/objtool/Documentation/klp-write-tests.txt Wed, 21 Oct 2026 00:55:04 +0200 Linus Torvalds <torvalds@linux-foundation.org> http://kernelsources.org:8080/source/history/linux/tools/objtool/Documentation/klp-write-tests.txt#2ab23a580d00fcf2a3dbb93b54b45d295aba835d objtool/klp: Document the klp test harnessTwo documents, for two different readers.klp-test-design.txt is for someone deciding whether to trust the suite orchange it: what makes unit tests possible for a pipeline that normallyneeds two kernel builds (objtool has no configuration-dependent logic, so atest reproduces a configuration by reproducing its input), how tests areselected per architecture, and what the outcome classification is for.klp-write-tests.txt is the procedure for adding one, and is written to behanded to someone -- or something -- with the instruction "follow this andwrite a test for commit <sha>", or "port the case at <location> fromanother harness". It leads with the rule that matters: a test is notfinished until you have watched it fail with the code broken. Then thetraps, each of which this suite has already fallen into -- a fixture thecompiler optimised away, a named char[] which never reaches the string pathbecause that keys on SHF_STRINGS, per-function sections hiding the movementa test was about.Some of this was previously written as comments in lib.sh. That was thewrong place: guidance on how to write a test is read once by an author,while every comment in the harness is read by everyone who opens it.Explanations of why the code is as it is stay where they were.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-5Link: https://patch.msgid.link/20260916184351.2720310-10-song@kernel.org List of files: /linux/tools/objtool/Documentation/klp-write-tests.txt Wed, 16 Sep 2026 20:43:02 +0200 Song Liu <song@kernel.org>