en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/objtool/tests/generic/test-switch-rodata.sh#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/tests/generic/test-switch-rodata.sh Wed, 21 Oct 2026 00:55:04 +0200 Linus Torvalds <torvalds@linux-foundation.org> http://kernelsources.org:8080/source/history/linux/tools/objtool/tests/generic/test-switch-rodata.sh#317cf7bbfa3de0fb61451e9b0b11d20831fb9f9a objtool/klp: Add test for Clang switch jump tablesFor a dense enough switch Clang emits the targets as a table in.rodata..Lswitch.table.<function> -- named after the function but not partof it. The patched function indexes into that table, so a clone which doesnot bring it along jumps through whatever the kernel's copy holds, whichafter a patch that changed the switch is the wrong set of targets. Anindirect jump to a stale address reports nothing at build or load time.The fixture asserts its own premise twice over, since both halves depend onwhat this Clang chose to do: that a table was built rather than a chain ofcomparisons, and that the added case actually changed it.objtool has no switch-specific code -- the table is carried by the generalmechanism for data a cloned function references -- so this guards thatmechanism reaching an easily-mishandled shape rather than a particularline, and the test says so. Making the table uncorrelated, the nearestavailable sabotage, does not change the outcome.Assisted-by: Claude:claude-opus-4Based-on-test-by: Joe Lawrence <joe.lawrence@redhat.com>Assisted-by: Claude:claude-opus-5Signed-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/20260916184351.2720310-58-song@kernel.org List of files: /linux/tools/objtool/tests/generic/test-switch-rodata.sh Wed, 16 Sep 2026 20:43:50 +0200 Song Liu <song@kernel.org>