[K/linux][PATCH] UBUNTU: [Packaging] Copy expoline.o only when the relevant config is enabled

[Andrei Gherzan]

BugLink: https://bugs.launchpad.net/bugs/2013209

The Jammy kernel enabled CONFIG_EXPOLINE_EXTERN for s390x. While this
works as expected on Jammy, it won't work on some derivatives of it: for
example focal:hwe-5.15. On Focal, this config can't be enabled due to
the GCC version it comes with. CONFIG_EXPOLINE_EXTERN requires >= 110200
while Focal comes with 90400.

This change adds a config check when packaging of the expoline.o.

Signed-off-by: Andrei Gherzan <andrei.gherzan at canonical.com>
---
 debian/rules.d/2-binary-arch.mk | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/debian/rules.d/2-binary-arch.mk b/debian/rules.d/2-binary-arch.mk
index 8e053f832b06..4fd528b0d7fd 100644
--- a/debian/rules.d/2-binary-arch.mk
+++ b/debian/rules.d/2-binary-arch.mk
@@ -335,8 +335,10 @@ ifeq ($(build_arch),powerpc)
 	cp $(builddir)/build-$*/arch/powerpc/lib/*.o $(hdrdir)/arch/powerpc/lib
 endif
 ifeq ($(build_arch),s390)
-	mkdir -p $(hdrdir)/arch/s390/lib/expoline/
-	cp $(builddir)/build-$*/arch/s390/lib/expoline/*.o $(hdrdir)/arch/s390/lib/expoline/
+	if grep -q CONFIG_EXPOLINE_EXTERN=y $(builddir)/build-$*/.config; then \
+		mkdir -p $(hdrdir)/arch/s390/lib/expoline/; \
+		cp $(builddir)/build-$*/arch/s390/lib/expoline/*.o $(hdrdir)/arch/s390/lib/expoline/; \
+	fi
 endif
 	# Copy over scripts/module.lds for building external modules
 	cp $(builddir)/build-$*/scripts/module.lds $(hdrdir)/scripts
-- 
2.34.1