xarray: port tests to kunit

Minimally rewrite the XArray unit tests to use kunit.  This integrates
nicely with existing kunit tools which produce nicer human-readable output
compared to the existing machinery.

Running the xarray tests before this change requires an obscure
invocation

```
tools/testing/kunit/kunit.py run --arch arm64 --make_options LLVM=1 \
  --kconfig_add CONFIG_TEST_XARRAY=y --raw_output=all nothing
```

which on failure produces

```
BUG at check_reserve:513
...
XArray: 6782340 of 6782364 tests passed
```

and exits 0.

Running the xarray tests after this change requires a simpler invocation

```
tools/testing/kunit/kunit.py run --arch arm64 --make_options LLVM=1 \
  xarray
```

which on failure produces (colors omitted)

```
[09:50:53] ====================== check_reserve  ======================
[09:50:53] [FAILED] param-0
[09:50:53]     # check_reserve: EXPECTATION FAILED at lib/test_xarray.c:536
[09:50:53] xa_erase(xa, 12345678) != NULL
...
[09:50:53]     # module: test_xarray
[09:50:53] # xarray: pass:26 fail:3 skip:0 total:29
[09:50:53] # Totals: pass:28 fail:3 skip:0 total:31
[09:50:53] ===================== [FAILED] xarray ======================
```

and exits 1.

Use of richer kunit assertions is intentionally omitted to reduce the
scope of the change.

[akpm@linux-foundation.org: fix cocci warning]
  Link: https://lore.kernel.org/oe-kbuild-all/202412081700.YXB3vBbg-lkp@intel.com/
Link: https://lkml.kernel.org/r/20241205-xarray-kunit-port-v1-1-ee44bc7aa201@gmail.com
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Naveen N Rao <naveen@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/m68k/configs/amiga_defconfig

@@ -629,7 +629,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/apollo_defconfig

@@ -586,7 +586,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/atari_defconfig

@@ -606,7 +606,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/bvme6000_defconfig

@@ -578,7 +578,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/hp300_defconfig

@@ -588,7 +588,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/mac_defconfig

@@ -605,7 +605,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/multi_defconfig

@@ -692,7 +692,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/mvme147_defconfig

@@ -578,7 +578,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/mvme16x_defconfig

@@ -579,7 +579,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/q40_defconfig

@@ -595,7 +595,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/sun3_defconfig

@@ -575,7 +575,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/m68k/configs/sun3x_defconfig

@@ -576,7 +576,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

arch/powerpc/configs/ppc64_defconfig

@@ -451,7 +451,6 @@ CONFIG_TEST_PRINTF=m
 CONFIG_TEST_SCANF=m
 CONFIG_TEST_BITMAP=m
 CONFIG_TEST_UUID=m
-CONFIG_TEST_XARRAY=m
 CONFIG_TEST_MAPLE_TREE=m
 CONFIG_TEST_RHASHTABLE=m
 CONFIG_TEST_IDA=m

lib/Kconfig.debug

@@ -2456,8 +2456,22 @@ config TEST_BITMAP
 config TEST_UUID
 	tristate "Test functions located in the uuid module at runtime"
 
-config TEST_XARRAY
+config XARRAY_KUNIT
-	tristate "Test the XArray code at runtime"
+	tristate "KUnit test XArray code at runtime" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
+	help
+	  Enable this option to test the Xarray code at boot.
+
+	  KUnit tests run during boot and output the results to the debug log
+	  in TAP format (http://testanything.org/). Only useful for kernel devs
+	  running the KUnit test harness, and not intended for inclusion into a
+	  production build.
+
+	  For more information on KUnit and unit tests in general please refer
+	  to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+	  If unsure, say N.
 
 config TEST_MAPLE_TREE
 	tristate "Test the Maple Tree code at runtime or module load"

lib/Makefile

@@ -94,7 +94,6 @@ GCOV_PROFILE_test_bitmap.o := n
 endif
 
 obj-$(CONFIG_TEST_UUID) += test_uuid.o
-obj-$(CONFIG_TEST_XARRAY) += test_xarray.o
 obj-$(CONFIG_TEST_MAPLE_TREE) += test_maple_tree.o
 obj-$(CONFIG_TEST_PARMAN) += test_parman.o
 obj-$(CONFIG_TEST_KMOD) += test_kmod.o
@@ -375,6 +374,7 @@ CFLAGS_bitfield_kunit.o := $(DISABLE_STRUCTLEAK_PLUGIN)
 obj-$(CONFIG_BITFIELD_KUNIT) += bitfield_kunit.o
 obj-$(CONFIG_CHECKSUM_KUNIT) += checksum_kunit.o
 obj-$(CONFIG_UTIL_MACROS_KUNIT) += util_macros_kunit.o
+obj-$(CONFIG_XARRAY_KUNIT) += test_xarray.o
 obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o
 obj-$(CONFIG_HASHTABLE_KUNIT_TEST) += hashtable_test.o
 obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o