Changes in klp-build

225d16dd510d92c8eaba8e6496cfaa7881a24827 - klp-build: Validate short-circuit prerequisites

Fri, 17 Apr 2026 22:33:55 +0200

klp-build: Validate short-circuit prerequisitesThe --short-circuit option implicitly requires that certain directoriesare already in klp-tmp. Enforce that to prevent confusing errors.Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

3b8e56b86faa3e44745aa764c2e1fd9dbbd16104 - objtool/klp: Remove "objtool --checksum"

Fri, 03 Apr 2026 22:10:29 +0200

objtool/klp: Remove "objtool --checksum"The checksum functionality has been moved to "objtool klp checksum"which is now used by klp-build. Remove the now-dead --checksum and--debug-checksum options from the default objtool command.Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

d4888d58041d1a61d66f2c81cb398f9685bc7576 - klp-build: Use "objtool klp checksum" subcommand

Fri, 03 Apr 2026 22:09:34 +0200

klp-build: Use "objtool klp checksum" subcommandUse the new "objtool klp checksum" subcommand instead of injecting--checksum into every objtool invocation via OBJTOOL_ARGS during thekernel build.This decouples checksum generation from the build, running it inseparate post-build passes, making the code (and the patch generationpipeline itself) more modular.Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

b6480aaedf3cbdd0a8e4b75c77434423eb52e3b8 - klp-build: Remove redundant SRC and OBJ variables

Thu, 30 Apr 2026 17:54:57 +0200

klp-build: Remove redundant SRC and OBJ variablesSRC and OBJ are both set to $(pwd) and are always identical. The scriptalready enforces that klp-build runs from the kernel root directory, andbuilds are done in-place, making these variables unnecessary.Suggested-by: Song Liu Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

e950d2a10a30aa5f3ebb92d4bf807d1d5dd96de1 - klp-build: Print "objtool klp diff" command in verbose mode

Sat, 04 Apr 2026 01:17:46 +0200

klp-build: Print "objtool klp diff" command in verbose modePrint the full objtool command line when '--verbose' is given to helpwith debugging.Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

df0d7bb04a27e48a0fb5fd32223f5ab248876cab - klp-build: Reject patches to realmode

Mon, 20 Apr 2026 04:57:48 +0200

klp-build: Reject patches to realmodeRealmode code is compiled as a separate 16-bit binary and embedded intothe kernel image via rmpiggy.S. It can't be livepatched.Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

d8c3e262361b04984f0322ce5b88ea52dab37318 - klp-build: Reject patches to vDSO

Sun, 12 Apr 2026 21:09:39 +0200

klp-build: Reject patches to vDSOvDSO code runs in userspace and can't be livepatched. Such patches alsocause spurious "new function" errors due to generated files likevdso*-image.c having unstable line numbers across builds.Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

f3048888ea62ac1c573db91e74e0dcabe058e89f - klp-build: Fix patch cleanup on interrupt

Fri, 03 Apr 2026 04:08:39 +0200

klp-build: Fix patch cleanup on interruptIf a build error occurs and the user hits Ctrl-C while a large patch isbeing reverted during cleanup, the cleanup EXIT trap gets re-triggeredand tries to re-revert the already partially-reverted patch. Thatcauses 'patch -R' to repeatedly prompt "Unreversed patch detected! Ignore -R? [n]"for each already-reverted hunk, with no way to break out.Fix it by adding '--force' to the patch revert command inrevert_patch(), which causes it to silently ignore already-revertedhunks. And ignore errors, as the cleanup is always best-effort.For similar reasons, add to APPLIED_PATCHES before (rather than after)applying the patch in apply_patch() so an interrupted apply will alsoget cleaned up.Fixes: d36a7343f4ba ("livepatch/klp-build: switch to GNU patch and recountdiff")Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

96524543740ead39a79cf36bb4361f93cde1629c - klp-build: Suppress excessive fuzz output by default

Sat, 04 Apr 2026 01:17:31 +0200

klp-build: Suppress excessive fuzz output by defaultWhen a patch applies with fuzz, the detailed output from the patch toolcan be very noisy, especially for big patches.Suppress the fuzz details by default, while keeping the "applied withfuzz" warning. The noise can be restored with '--verbose'.Acked-by: Song Liu Reviewed-by: Miroslav Benes Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

b3ece3019e8ebcda5e8451580e34bfbc97ef33e3 - klp-build: Validate patch file existence

Fri, 03 Apr 2026 04:48:45 +0200

klp-build: Validate patch file existenceMake sure all patch files actually exist. Otherwise there can beconfusing errors later.Acked-by: Song Liu Reviewed-by: Miroslav Benes Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

946d3510fe19dca5cf8c1ea5d5eedff47a72ddc3 - klp-build: Don't use errexit

Mon, 06 Apr 2026 01:17:08 +0200

klp-build: Don't use errexitThe errtrace option (combined with the ERR trap) already serves the samefunction (and more) as errexit, so errexit is redundant. And it hasmore pitfalls. Remove it.Acked-by: Song Liu Reviewed-by: Miroslav Benes Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

ba77fe55781a2464f68b6c13b4b31d05abd2abcf - klp-build: Fix checksum comparison for changed offsets

Sat, 11 Apr 2026 06:49:56 +0200

klp-build: Fix checksum comparison for changed offsetsThe klp-build -f/--show-first-changed feature uses diff to comparechecksum log lines between original and patched objects. However, diffcompares entire lines, including the offset field. When a function isat a different section offset, the offset field differs even though theinstruction checksum is identical, causing the wrong instruction to beprinted.Only compare the checksum field when looking for the first changedinstruction. Also print both the original and patched offsets when theydiffer.Fixes: 78be9facfb5e ("livepatch/klp-build: Add --show-first-changed option to show function divergence")Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

cc39ccce7d5bc623100f07dcda070cef1bf690f6 - klp-build: Fix hang on out-of-date .config

Fri, 03 Apr 2026 04:47:10 +0200

klp-build: Fix hang on out-of-date .configIf .config is out of date with the kernel source, 'make syncconfig'hangs while waiting for user input on new config options. Detect themismatch and return an error.Fixes: 6f93f7b06810 ("livepatch/klp-build: Fix inconsistent kernel version")Acked-by: Song Liu Signed-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

4b2bdc22210e39a02b3dc984cb8eb6b3293a56a7 - Merge tag 'objtool-core-2026-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Tue, 14 Apr 2026 22:00:04 +0200

Merge tag 'objtool-core-2026-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull objtool updates from Ingo Molnar: - KLP support updates and fixes (Song Liu) - KLP-build script updates and fixes (Joe Lawrence) - Support Clang RAX DRAP sequence, to address clang false positive (Josh Poimboeuf) - Reorder ORC register numbering to match regular x86 register numbering (Josh Poimboeuf) - Misc cleanups (Wentong Tian, Song Liu)* tag 'objtool-core-2026-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool/x86: Reorder ORC register numbering objtool: Support Clang RAX DRAP sequence livepatch/klp-build: report patch validation fuzz livepatch/klp-build: add terminal color output livepatch/klp-build: provide friendlier error messages livepatch/klp-build: improve short-circuit validation livepatch/klp-build: fix shellcheck complaints livepatch/klp-build: add Makefile with check target livepatch/klp-build: add grep-override function livepatch/klp-build: switch to GNU patch and recountdiff livepatch/klp-build: support patches that add/remove files objtool/klp: Correlate locals to globals objtool/klp: Match symbols based on demangled_name for global variables objtool/klp: Remove .llvm suffix in demangle_name() objtool/klp: Also demangle global objects objtool/klp: Use sym->demangled_name for symbol_name hash objtool/klp: Remove trailing '_' in demangle_name() objtool/klp: Remove redundant strcmp() in correlate_symbols() objtool: Use section/symbol type helpers List of files: /linux/scripts/livepatch/klp-build

51a0b7c4ede5c775e9d362e5f465ca993e076823 - livepatch/klp-build: report patch validation fuzz

Tue, 10 Mar 2026 21:37:51 +0100

livepatch/klp-build: report patch validation fuzzCapture the output of the patch command to detect when a patch applieswith fuzz or line offsets.If such "fuzz" is detected during the validation phase, warn the userand display the details. This helps identify input patches that mayneed refreshing against the target source tree.Ensure that internal patch operations (such as those in refresh_patch orduring the final build phase) can still run quietly.Signed-off-by: Joe Lawrence Acked-by: Song Liu Link: https://patch.msgid.link/20260310203751.1479229-13-joe.lawrence@redhat.comSigned-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

1fbc9b855f08f89ccf933324a5cbd8c53ee94d87 - livepatch/klp-build: add terminal color output

Tue, 10 Mar 2026 21:37:50 +0100

livepatch/klp-build: add terminal color outputImprove the readability of klp-build output by implementing a basiccolor scheme. When the standard output and error are connected to aterminal, highlight status messages in bold and warning/error prefixesin yellow/red.Acked-by: Song Liu Signed-off-by: Joe Lawrence Link: https://patch.msgid.link/20260310203751.1479229-12-joe.lawrence@redhat.comSigned-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

b41d8b7d1752f2f85fc1a87f5e4f4dda45adad15 - livepatch/klp-build: provide friendlier error messages

Tue, 10 Mar 2026 21:37:49 +0100

livepatch/klp-build: provide friendlier error messagesProvide more context for common klp-build failure modes. Clarify whichuser-provided patch is unsupported or failed to apply, and explicitlyidentify which kernel build (original or patched) failed.Acked-by: Song Liu Signed-off-by: Joe Lawrence Link: https://patch.msgid.link/20260310203751.1479229-11-joe.lawrence@redhat.comSigned-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

6f93f7b06810d04acc6b106a7d5ecd6000f80545 - livepatch/klp-build: Fix inconsistent kernel version

Tue, 10 Mar 2026 21:37:48 +0100

livepatch/klp-build: Fix inconsistent kernel versionIf .config hasn't been synced with auto.conf, any recent changes toCONFIG_LOCALVERSION* may not get reflected in the kernel version name.Use "make syncconfig" to force them to sync, and "make -s kernelrelease"to get the version instead of having to construct it manually.Fixes: 24ebfcd65a87 ("livepatch/klp-build: Introduce klp-build script for generating livepatch modules")Closes: https://lore.kernel.org/20260217160645.3434685-10-joe.lawrence@redhat.comReported-by: Joe Lawrence Signed-off-by: Josh Poimboeuf Signed-off-by: Joe Lawrence Acked-by: Song Liu Link: https://patch.msgid.link/20260310203751.1479229-10-joe.lawrence@redhat.comSigned-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

e506ad210d6d7aeaff4bca777428c8c8f9850150 - livepatch/klp-build: improve short-circuit validation

Tue, 10 Mar 2026 21:37:47 +0100

livepatch/klp-build: improve short-circuit validationUpdate SHORT_CIRCUIT behavior to better handle patch validation andargument processing in later klp-build steps.Perform patch validation for both step 1 (building original kernel) andstep 2 (building patched kernel) to ensure patches are verified beforeany compilation occurs.Additionally, allow the user to omit input patches when skipping paststep 2.Acked-by: Song Liu Signed-off-by: Joe Lawrence Link: https://patch.msgid.link/20260310203751.1479229-9-joe.lawrence@redhat.comSigned-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build

b4a53519393521c68ec65f43bfebd64f178e6220 - livepatch/klp-build: fix shellcheck complaints

Tue, 10 Mar 2026 21:37:46 +0100

livepatch/klp-build: fix shellcheck complaintsFix or suppress the following shellcheck warnings: In klp-build line 57: command grep "$@" || true ^--^ SC2317 (info): Command appears to be unreachable. Check usage (or ignore if invoked indirectly).Fix the following warning: In klp-build line 565: local file_dir="$(dirname "$file")" ^------^ SC2034 (warning): file_dir appears unused. Verify use (or export if used externally).Acked-by: Song Liu Signed-off-by: Joe Lawrence Link: https://patch.msgid.link/20260310203751.1479229-8-joe.lawrence@redhat.comSigned-off-by: Josh Poimboeuf List of files: /linux/scripts/livepatch/klp-build