[PATCH v2 2/4] selftests: livepatch: Avoid running the tests if kernel-devel is missing

[Marcos Paulo de Souza <mpdesouza@suse.com>]

By checking if KDIR is a valid directory we can safely skip the tests if
kernel-devel isn't installed (default value of KDIR), or if KDIR
variable passed doesn't exists.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202402191417.XULH88Ct-lkp@intel.com/
Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
---
 tools/testing/selftests/livepatch/functions.sh          | 13 +++++++++++++
 tools/testing/selftests/livepatch/test_modules/Makefile |  6 ++++++
 2 files changed, 19 insertions(+)

diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
index e60cf09491a6..f0ed148d3c51 100644
--- a/tools/testing/selftests/livepatch/functions.sh
+++ b/tools/testing/selftests/livepatch/functions.sh
@@ -34,6 +34,18 @@ function is_root() {
 	fi
 }
 
+# Check if we can compile the modules before loading them
+function has_kdir() {
+	if [ -z "$KDIR" ]; then
+		KDIR="/lib/modules/$(uname -r)/build"
+	fi
+
+	if [ ! -d "$KDIR" ]; then
+		echo "skip all tests: KDIR ($KDIR) not available to compile modules."
+		exit $ksft_skip
+	fi
+}
+
 # die(msg) - game over, man
 #	msg - dying words
 function die() {
@@ -108,6 +120,7 @@ function cleanup() {
 #		 the ftrace_enabled sysctl.
 function setup_config() {
 	is_root
+	has_kdir
 	push_config
 	set_dynamic_debug
 	set_ftrace_enabled 1
diff --git a/tools/testing/selftests/livepatch/test_modules/Makefile b/tools/testing/selftests/livepatch/test_modules/Makefile
index f5e880269bff..e6e638c4bcba 100644
--- a/tools/testing/selftests/livepatch/test_modules/Makefile
+++ b/tools/testing/selftests/livepatch/test_modules/Makefile
@@ -13,8 +13,14 @@ obj-m += test_klp_atomic_replace.o \
 	test_klp_shadow_vars.o \
 	test_klp_syscall.o
 
+# Ensure that KDIR exists, otherwise skip the compilation
 modules:
+ifneq ("$(wildcard $(KDIR))", "")
 	$(Q)$(MAKE) -C $(KDIR) modules KBUILD_EXTMOD=$(TESTMODS_DIR)
+endif
 
+# Ensure that KDIR exists, otherwise skip the clean target
 clean:
+ifneq ("$(wildcard $(KDIR))", "")
 	$(Q)$(MAKE) -C $(KDIR) clean KBUILD_EXTMOD=$(TESTMODS_DIR)
+endif

-- 
2.42.1