linux-toradex.git/scripts/livepatch, branch master

klp-build: Validate short-circuit prerequisites

2026-05-05T04:16:06+00:00

The --short-circuit option implicitly requires that certain directories
are already in klp-tmp.  Enforce that to prevent confusing errors.

Acked-by: Song Liu 
Signed-off-by: Josh Poimboeuf

objtool/klp: Remove "objtool --checksum"

2026-05-05T04:16:05+00:00

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

klp-build: Use "objtool klp checksum" subcommand

2026-05-05T04:16:05+00:00

Use the new "objtool klp checksum" subcommand instead of injecting
--checksum into every objtool invocation via OBJTOOL_ARGS during the
kernel build.

This decouples checksum generation from the build, running it in
separate post-build passes, making the code (and the patch generation
pipeline itself) more modular.

Acked-by: Song Liu 
Signed-off-by: Josh Poimboeuf

klp-build: Remove redundant SRC and OBJ variables

2026-05-05T04:16:04+00:00

SRC and OBJ are both set to $(pwd) and are always identical.  The script
already enforces that klp-build runs from the kernel root directory, and
builds are done in-place, making these variables unnecessary.

Suggested-by: Song Liu 
Acked-by: Song Liu 
Signed-off-by: Josh Poimboeuf

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

2026-05-05T04:16:04+00:00

Print the full objtool command line when '--verbose' is given to help
with debugging.

Acked-by: Song Liu 
Signed-off-by: Josh Poimboeuf

klp-build: Reject patches to realmode

2026-05-05T04:16:03+00:00

Realmode code is compiled as a separate 16-bit binary and embedded into
the kernel image via rmpiggy.S.  It can't be livepatched.

Acked-by: Song Liu 
Signed-off-by: Josh Poimboeuf

klp-build: Reject patches to vDSO

2026-05-05T04:16:03+00:00

vDSO code runs in userspace and can't be livepatched.  Such patches also
cause spurious "new function" errors due to generated files like
vdso*-image.c having unstable line numbers across builds.

Acked-by: Song Liu 
Signed-off-by: Josh Poimboeuf

klp-build: Fix patch cleanup on interrupt

2026-05-05T04:16:03+00:00

If a build error occurs and the user hits Ctrl-C while a large patch is
being reverted during cleanup, the cleanup EXIT trap gets re-triggered
and tries to re-revert the already partially-reverted patch.  That
causes '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 in
revert_patch(), which causes it to silently ignore already-reverted
hunks.  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 also
get cleaned up.

Fixes: d36a7343f4ba ("livepatch/klp-build: switch to GNU patch and recountdiff")
Acked-by: Song Liu 
Signed-off-by: Josh Poimboeuf

klp-build: Suppress excessive fuzz output by default

2026-05-05T04:16:03+00:00

When a patch applies with fuzz, the detailed output from the patch tool
can be very noisy, especially for big patches.

Suppress the fuzz details by default, while keeping the "applied with
fuzz" warning.  The noise can be restored with '--verbose'.

Acked-by: Song Liu 
Reviewed-by: Miroslav Benes 
Signed-off-by: Josh Poimboeuf

klp-build: Validate patch file existence

2026-05-05T04:16:03+00:00

Make sure all patch files actually exist.  Otherwise there can be
confusing errors later.

Acked-by: Song Liu 
Reviewed-by: Miroslav Benes 
Signed-off-by: Josh Poimboeuf