From: Josh Poimboeuf <[email protected]> Sent: Wednesday, November 12, 2025 3:33 PM > > With CONFIG_KLP_BUILD enabled, checksums are only needed during a > klp-build run. There's no need to enable them for normal kernel builds. > > This also has the benefit of softening the xxhash dependency. > > Signed-off-by: Josh Poimboeuf <[email protected]> > --- > arch/x86/boot/startup/Makefile | 2 +- > scripts/Makefile.lib | 1 - > scripts/livepatch/klp-build | 4 ++++ > 3 files changed, 5 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/boot/startup/Makefile b/arch/x86/boot/startup/Makefile > index e8fdf020b422..5e499cfb29b5 100644 > --- a/arch/x86/boot/startup/Makefile > +++ b/arch/x86/boot/startup/Makefile > @@ -36,7 +36,7 @@ $(patsubst %.o,$(obj)/%.o,$(lib-y)): > OBJECT_FILES_NON_STANDARD := y > # relocations, even if other objtool actions are being deferred. > # > $(pi-objs): objtool-enabled = 1 > -$(pi-objs): objtool-args = $(if $(delay-objtool),,$(objtool-args-y)) > --noabs > +$(pi-objs): objtool-args = $(if > $(delay-objtool),--dry-run,$(objtool-args-y)) --noabs > > # > # Confine the startup code by prefixing all symbols with __pi_ (for position > diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib > index f4b33919ec37..28a1c08e3b22 100644 > --- a/scripts/Makefile.lib > +++ b/scripts/Makefile.lib > @@ -173,7 +173,6 @@ ifdef CONFIG_OBJTOOL > > objtool := $(objtree)/tools/objtool/objtool > > -objtool-args-$(CONFIG_KLP_BUILD) += --checksum > objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label > objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr > objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) += > --hacks=skylake > diff --git a/scripts/livepatch/klp-build b/scripts/livepatch/klp-build > index 881e052e7fae..882272120c9e 100755 > --- a/scripts/livepatch/klp-build > +++ b/scripts/livepatch/klp-build > @@ -489,8 +489,11 @@ clean_kernel() { > > build_kernel() { > local log="$TMP_DIR/build.log" > + local objtool_args=() > local cmd=() > > + objtool_args=("--checksum") > + > cmd=("make") > > # When a patch to a kernel module references a newly created unexported > @@ -513,6 +516,7 @@ build_kernel() { > cmd+=("$VERBOSE") > cmd+=("-j$JOBS") > cmd+=("KCFLAGS=-ffunction-sections -fdata-sections") > + cmd+=("OBJTOOL_ARGS=${objtool_args[*]}") > cmd+=("vmlinux") > cmd+=("modules") > > -- > 2.51.1
Did a normal linux-next kernel build on an Ubuntu 20.04 system, which by default does not have xxhash installed. Previous error about needing to install libxxhash-dev is no longer generated. Have not tested a klp-build. Tested-by: Michael Kelley <[email protected]>
