selftests: vDSO: unconditionally build getrandom test

Rather than building on supported archs, build on all archs, and then
use the presence of the symbol in the vDSO to either skip the test or
move forward with it.

Note that this means that this test no longer checks whether the symbol
was correctly added to the kernel. But hopefully this will be clear
enough to developers and we'll cross our fingers that symbols aren't
removed by accident and not caught after this change.

Signed-off-by: Jason A. Donenfeld <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: zx2c4

tools/testing/selftests/vDSO/Makefile

@@ -9,9 +9,7 @@ ifeq ($(ARCH),$(filter $(ARCH),x86 x86_64))
 TEST_GEN_PROGS += vdso_standalone_test_x86
 endif
 TEST_GEN_PROGS += vdso_test_correctness
-ifeq ($(ARCH)$(CONFIG_X86_32),$(filter $(ARCH)$(CONFIG_X86_32),x86 x86_64 loongarch arm64 powerpc s390))
 TEST_GEN_PROGS += vdso_test_getrandom
-endif
 TEST_GEN_PROGS += vdso_test_chacha
 
 CFLAGS := -std=gnu99 -O2

tools/testing/selftests/vDSO/vdso_test_getrandom.c

@@ -121,7 +121,7 @@ static void vgetrandom_init(void)
 	vgrnd.fn = (__typeof__(vgrnd.fn))vdso_sym(version, name);
 	if (!vgrnd.fn) {
 		printf("%s is missing!\n", name);
-		exit(KSFT_FAIL);
+		exit(KSFT_SKIP);
 	}
 	ret = VDSO_CALL(vgrnd.fn, 5, NULL, 0, 0, &vgrnd.params, ~0UL);
 	if (ret == -ENOSYS) {