[PATCH v3 14/24] selftests/liveupdate: Move luo_test_utils.* into a reusable library

David Matlack
2026-03-23T23:59:09Z

From: Vipin Sharma <vipinsh@google.com>

Move luo_test_utils.[ch] into a lib/ directory and pull the rules to
build them out into a separate make script. This will enable these
utilities to be also built by and used within other selftests (such as
VFIO) in subsequent commits.

No functional change intended.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
Co-developed-by: David Matlack <dmatlack@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
---
tools/testing/selftests/liveupdate/.gitignore | 1 +
tools/testing/selftests/liveupdate/Makefile | 14 ++++---------
.../include/libliveupdate.h} | 8 ++++----
.../selftests/liveupdate/lib/libliveupdate.mk | 20 +++++++++++++++++++
.../{luo_test_utils.c => lib/liveupdate.c} | 2 +-
.../selftests/liveupdate/luo_kexec_simple.c | 2 +-
.../selftests/liveupdate/luo_multi_session.c | 2 +-
7 files changed, 32 insertions(+), 17 deletions(-)
rename tools/testing/selftests/liveupdate/{luo_test_utils.h => lib/include/libliveupdate.h} (87%)
create mode 100644 tools/testing/selftests/liveupdate/lib/libliveupdate.mk
rename tools/testing/selftests/liveupdate/{luo_test_utils.c => lib/liveupdate.c} (99%)

diff --git a/tools/testing/selftests/liveupdate/.gitignore b/tools/testing/selftests/liveupdate/.gitignore
index 661827083ab6..18a0c7036cf3 100644
--- a/tools/testing/selftests/liveupdate/.gitignore
+++ b/tools/testing/selftests/liveupdate/.gitignore
@@ -3,6 +3,7 @@
!/**/
!*.c
!*.h
+!*.mk
!*.sh
!.gitignore
!config
diff --git a/tools/testing/selftests/liveupdate/Makefile b/tools/testing/selftests/liveupdate/Makefile
index 080754787ede..a060cc21f27f 100644
--- a/tools/testing/selftests/liveupdate/Makefile
+++ b/tools/testing/selftests/liveupdate/Makefile
@@ -1,7 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only

-LIB_C += luo_test_utils.c
-
TEST_GEN_PROGS += liveupdate

TEST_GEN_PROGS_EXTENDED += luo_kexec_simple
@@ -10,25 +8,21 @@ TEST_GEN_PROGS_EXTENDED += luo_multi_session
TEST_FILES += do_kexec.sh

include ../lib.mk
+include lib/libliveupdate.mk

CFLAGS += $(KHDR_INCLUDES)
CFLAGS += -Wall -O2 -Wno-unused-function
CFLAGS += -MD

-LIB_O := $(patsubst %.c, $(OUTPUT)/%.o, $(LIB_C))
TEST_O := $(patsubst %, %.o, $(TEST_GEN_PROGS))
TEST_O += $(patsubst %, %.o, $(TEST_GEN_PROGS_EXTENDED))

-TEST_DEP_FILES := $(patsubst %.o, %.d, $(LIB_O))
+TEST_DEP_FILES := $(patsubst %.o, %.d, $(LIBLIVEUPDATE_O))
TEST_DEP_FILES += $(patsubst %.o, %.d, $(TEST_O))
-include $(TEST_DEP_FILES)

-$(LIB_O): $(OUTPUT)/%.o: %.c
- $(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
-
-$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(OUTPUT)/%: %.o $(LIB_O)
- $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $< $(LIB_O) $(LDLIBS) -o $@
+$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(OUTPUT)/%: %.o $(LIBLIVEUPDATE_O)
+ $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $< $(LIBLIVEUPDATE_O) $(LDLIBS) -o $@

-EXTRA_CLEAN += $(LIB_O)
EXTRA_CLEAN += $(TEST_O)
EXTRA_CLEAN += $(TEST_DEP_FILES)
diff --git a/tools/testing/selftests/liveupdate/luo_test_utils.h b/tools/testing/selftests/liveupdate/lib/include/libliveupdate.h
similarity index 87%
rename from tools/testing/selftests/liveupdate/luo_test_utils.h
rename to tools/testing/selftests/liveupdate/lib/include/libliveupdate.h
index 90099bf49577..4390a2737930 100644
--- a/tools/testing/selftests/liveupdate/luo_test_utils.h
+++ b/tools/testing/selftests/liveupdate/lib/include/libliveupdate.h
@@ -7,13 +7,13 @@
* Utility functions for LUO kselftests.
*/

-#ifndef LUO_TEST_UTILS_H
-#define LUO_TEST_UTILS_H
+#ifndef SELFTESTS_LIVEUPDATE_LIB_LIVEUPDATE_H
+#define SELFTESTS_LIVEUPDATE_LIB_LIVEUPDATE_H

#include <errno.h>
#include <string.h>
#include <linux/liveupdate.h>
-#include "../kselftest.h"
+#include "../../../kselftest.h"

#define LUO_DEVICE "/dev/liveupdate"

@@ -41,4 +41,4 @@ typedef void (*luo_test_stage2_fn)(int luo_fd, int state_session_fd);
int luo_test(int argc, char *argv[], const char *state_session_name,
luo_test_stage1_fn stage1, luo_test_stage2_fn stage2);

-#endif /* LUO_TEST_UTILS_H */
+#endif /* SELFTESTS_LIVEUPDATE_LIB_LIVEUPDATE_H */
diff --git a/tools/testing/selftests/liveupdate/lib/libliveupdate.mk b/tools/testing/selftests/liveupdate/lib/libliveupdate.mk
new file mode 100644
index 000000000000..fffd95b085b6
--- /dev/null
+++ b/tools/testing/selftests/liveupdate/lib/libliveupdate.mk
@@ -0,0 +1,20 @@
+include $(top_srcdir)/scripts/subarch.include
+ARCH ?= $(SUBARCH)
+
+LIBLIVEUPDATE_SRCDIR := $(selfdir)/liveupdate/lib
+
+LIBLIVEUPDATE_C := liveupdate.c
+
+LIBLIVEUPDATE_OUTPUT := $(OUTPUT)/libliveupdate
+
+LIBLIVEUPDATE_O := $(patsubst %.c, $(LIBLIVEUPDATE_OUTPUT)/%.o, $(LIBLIVEUPDATE_C))
+
+LIBLIVEUPDATE_O_DIRS := $(shell dirname $(LIBLIVEUPDATE_O) | uniq)
+$(shell mkdir -p $(LIBLIVEUPDATE_O_DIRS))
+
+CFLAGS += -I$(LIBLIVEUPDATE_SRCDIR)/include
+
+$(LIBLIVEUPDATE_O): $(LIBLIVEUPDATE_OUTPUT)/%.o : $(LIBLIVEUPDATE_SRCDIR)/%.c
+ $(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
+
+EXTRA_CLEAN += $(LIBLIVEUPDATE_OUTPUT)
diff --git a/tools/testing/selftests/liveupdate/luo_test_utils.c b/tools/testing/selftests/liveupdate/lib/liveupdate.c
similarity index 99%
rename from tools/testing/selftests/liveupdate/luo_test_utils.c
rename to tools/testing/selftests/liveupdate/lib/liveupdate.c
index 3c8721c505df..60121873f685 100644
--- a/tools/testing/selftests/liveupdate/luo_test_utils.c
+++ b/tools/testing/selftests/liveupdate/lib/liveupdate.c
@@ -21,7 +21,7 @@
#include <errno.h>
#include <stdarg.h>

-#include "luo_test_utils.h"
+#include <libliveupdate.h>

int luo_open_device(void)
{
diff --git a/tools/testing/selftests/liveupdate/luo_kexec_simple.c b/tools/testing/selftests/liveupdate/luo_kexec_simple.c
index d7ac1f3dc4cb..786ac93b9ae3 100644
--- a/tools/testing/selftests/liveupdate/luo_kexec_simple.c
+++ b/tools/testing/selftests/liveupdate/luo_kexec_simple.c
@@ -8,7 +8,7 @@
* across a single kexec reboot.
*/

-#include "luo_test_utils.h"
+#include <libliveupdate.h>

#define TEST_SESSION_NAME "test-session"
#define TEST_MEMFD_TOKEN 0x1A
diff --git a/tools/testing/selftests/liveupdate/luo_multi_session.c b/tools/testing/selftests/liveupdate/luo_multi_session.c
index 0ee2d795beef..aac24a5f5ce3 100644
--- a/tools/testing/selftests/liveupdate/luo_multi_session.c
+++ b/tools/testing/selftests/liveupdate/luo_multi_session.c
@@ -9,7 +9,7 @@
* files.
*/

-#include "luo_test_utils.h"
+#include <libliveupdate.h>

#define SESSION_EMPTY_1 "multi-test-empty-1"
#define SESSION_EMPTY_2 "multi-test-empty-2"
--
2.53.0.983.g0bb29b3bc5-goog