[PATCH] tools/testing/cxl: Disable "missing prototypes / declarations" warnings

[Dan Williams <dan.j.williams@intel.com>]

Prevent warnings of the form:

tools/testing/cxl/test/mock.c:44:6: error: no previous prototype for
‘__wrap_is_acpi_device_node’ [-Werror=missing-prototypes]

tools/testing/cxl/test/mock.c:63:5: error: no previous prototype for
‘__wrap_acpi_table_parse_cedt’ [-Werror=missing-prototypes]

tools/testing/cxl/test/mock.c:81:13: error: no previous prototype for
‘__wrap_acpi_evaluate_integer’ [-Werror=missing-prototypes]

...by locally disabling some warnings.

It turns out that:

Commit 0fcb70851fbf ("Makefile.extrawarn: turn on missing-prototypes globally")

...in addition to expanding in-tree coverage, also impacts out-of-tree
module builds like those in tools/testing/cxl/.

Filter out the warning options on unit test code that does not effect
mainline builds.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 tools/testing/cxl/Kbuild      |    2 ++
 tools/testing/cxl/test/Kbuild |    2 ++
 2 files changed, 4 insertions(+)

diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild
index 0b12c36902d8..caff3834671f 100644
--- a/tools/testing/cxl/Kbuild
+++ b/tools/testing/cxl/Kbuild
@@ -65,4 +65,6 @@ cxl_core-y += config_check.o
 cxl_core-y += cxl_core_test.o
 cxl_core-y += cxl_core_exports.o
 
+KBUILD_CFLAGS := $(filter-out -Wmissing-prototypes -Wmissing-declarations, $(KBUILD_CFLAGS))
+
 obj-m += test/
diff --git a/tools/testing/cxl/test/Kbuild b/tools/testing/cxl/test/Kbuild
index 61d5f7bcddf9..6b1927897856 100644
--- a/tools/testing/cxl/test/Kbuild
+++ b/tools/testing/cxl/test/Kbuild
@@ -8,3 +8,5 @@ obj-m += cxl_mock_mem.o
 cxl_test-y := cxl.o
 cxl_mock-y := mock.o
 cxl_mock_mem-y := mem.o
+
+KBUILD_CFLAGS := $(filter-out -Wmissing-prototypes -Wmissing-declarations, $(KBUILD_CFLAGS))