[PATCH v2 4/5] tools: Add support for running rosebush tests in userspace

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Enable make -C tools/testing/radix-tree.  Much easier to debug than
an in-kernel module.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 tools/include/linux/rosebush.h        |  1 +
 tools/testing/radix-tree/.gitignore   |  1 +
 tools/testing/radix-tree/Makefile     |  6 ++++-
 tools/testing/radix-tree/kunit/test.h | 20 +++++++++++++++
 tools/testing/radix-tree/rosebush.c   | 36 +++++++++++++++++++++++++++
 5 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 tools/include/linux/rosebush.h
 create mode 100644 tools/testing/radix-tree/kunit/test.h
 create mode 100644 tools/testing/radix-tree/rosebush.c

diff --git a/tools/include/linux/rosebush.h b/tools/include/linux/rosebush.h
new file mode 100644
index 000000000000..3f12f4288250
--- /dev/null
+++ b/tools/include/linux/rosebush.h
@@ -0,0 +1 @@
+#include "../../../include/linux/rosebush.h"
diff --git a/tools/testing/radix-tree/.gitignore b/tools/testing/radix-tree/.gitignore
index 49bccb90c35b..fb154f26bdab 100644
--- a/tools/testing/radix-tree/.gitignore
+++ b/tools/testing/radix-tree/.gitignore
@@ -9,3 +9,4 @@ radix-tree.c
 xarray
 maple
 ma_xa_benchmark
+rosebush
diff --git a/tools/testing/radix-tree/Makefile b/tools/testing/radix-tree/Makefile
index 7527f738b4a1..982ff4b7fdeb 100644
--- a/tools/testing/radix-tree/Makefile
+++ b/tools/testing/radix-tree/Makefile
@@ -4,7 +4,7 @@ CFLAGS += -I. -I../../include -I../../../lib -g -Og -Wall \
 	  -D_LGPL_SOURCE -fsanitize=address -fsanitize=undefined
 LDFLAGS += -fsanitize=address -fsanitize=undefined
 LDLIBS+= -lpthread -lurcu
-TARGETS = main idr-test multiorder xarray maple
+TARGETS = main idr-test multiorder xarray maple rosebush
 CORE_OFILES := xarray.o radix-tree.o idr.o linux.o test.o find_bit.o bitmap.o \
 			 slab.o maple.o
 OFILES = main.o $(CORE_OFILES) regression1.o regression2.o regression3.o \
@@ -36,6 +36,8 @@ xarray: $(CORE_OFILES)
 
 maple: $(CORE_OFILES)
 
+rosebush: $(CORE_OFILES)
+
 multiorder: multiorder.o $(CORE_OFILES)
 
 clean:
@@ -62,6 +64,8 @@ xarray.o: ../../../lib/xarray.c ../../../lib/test_xarray.c
 
 maple.o: ../../../lib/maple_tree.c ../../../lib/test_maple_tree.c
 
+rosebush.o: ../../../lib/rosebush.c ../../../lib/test_rosebush.c
+
 generated/map-shift.h:
 	@if ! grep -qws $(SHIFT) generated/map-shift.h; then		\
 		echo "#define XA_CHUNK_SHIFT $(SHIFT)" >		\
diff --git a/tools/testing/radix-tree/kunit/test.h b/tools/testing/radix-tree/kunit/test.h
new file mode 100644
index 000000000000..0805e3695762
--- /dev/null
+++ b/tools/testing/radix-tree/kunit/test.h
@@ -0,0 +1,20 @@
+struct kunit {
+};
+
+struct kunit_case {
+	void (*run_case)(struct kunit *test);
+};
+
+struct kunit_suite {
+	char *name;
+	struct kunit_case *test_cases;
+};
+
+#define KUNIT_CASE(test_name) { .run_case = test_name, }
+#define kunit_test_suite(x)
+
+#define KUNIT_EXPECT_EQ(test, left, right)				\
+	KUNIT_EXPECT_PTR_EQ_MSG(test, left, right, NULL)
+#define KUNIT_EXPECT_PTR_EQ_MSG(test, left, right, fmt, ...)		\
+	assert(left == right)
+
diff --git a/tools/testing/radix-tree/rosebush.c b/tools/testing/radix-tree/rosebush.c
new file mode 100644
index 000000000000..51703737833e
--- /dev/null
+++ b/tools/testing/radix-tree/rosebush.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * rosebush.c: Userspace testing for rosebush test-suite
+ * Copyright (c) 2024 Oracle Corporation
+ * Author: Matthew Wilcox <willy@infradead.org>
+ */
+
+#include "test.h"
+#include <stdlib.h>
+#include <time.h>
+
+#define module_init(x)
+#define module_exit(x)
+#define MODULE_AUTHOR(x)
+#define MODULE_LICENSE(x)
+#define dump_stack()	assert(0)
+
+#include "../../../lib/rosebush.c"
+#include "../../../lib/test_rosebush.c"
+
+int __weak main(void)
+{
+	struct kunit test;
+	int i;
+
+	assert(rosebush_suite.test_cases == rosebush_cases);
+
+	for (i = 0; i < ARRAY_SIZE(rosebush_cases); i++) {
+		if (!rosebush_cases[i].run_case)
+			continue;
+		printf("i = %d %p\n", i, rosebush_cases[i].run_case);
+		rosebush_cases[i].run_case(&test);
+	}
+
+	return 0;
+}
-- 
2.43.0