selftests/powerpc: Only test lwm/stmw on big endian

Newer binutils (>= 2.36) refuse to assemble lmw/stmw when building in
little endian mode. That breaks compilation of our alignment handler
test:

  /tmp/cco4l14N.s: Assembler messages:
  /tmp/cco4l14N.s:1440: Error: `lmw' invalid when little-endian
  /tmp/cco4l14N.s:1814: Error: `stmw' invalid when little-endian
  make[2]: *** [../../lib.mk:139: /output/kselftest/powerpc/alignment/alignment_handler] Error 1

These tests do pass on little endian machines, as the kernel will
still emulate those instructions even when running little
endian (which is arguably a kernel bug).

But we don't really need to test that case, so ifdef those
instructions out to get the alignment test building again.

Reported-by: Libor Pechacek <lpechacek@suse.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Libor Pechacek <lpechacek@suse.com>
Link: https://lore.kernel.org/r/20210119041800.3093047-1-mpe@ellerman.id.au

diff --git a/tools/testing/selftests/powerpc/alignment/alignment_handler.c b/tools/testing/selftests/powerpc/alignment/alignment_handler.c
index cb53a8b777e68a7fc49c5c7ed1d249cb13c0e1d1..c25cf7cd45e9fdb8ec328c5e5a8dff16bc993e05 100644 (file)
--- a/tools/testing/selftests/powerpc/alignment/alignment_handler.c
+++ b/tools/testing/selftests/powerpc/alignment/alignment_handler.c
@@ -443,7 +443,6 @@ int test_alignment_handler_integer(void)
        LOAD_DFORM_TEST(ldu);
        LOAD_XFORM_TEST(ldx);
        LOAD_XFORM_TEST(ldux);
-       LOAD_DFORM_TEST(lmw);
        STORE_DFORM_TEST(stb);
        STORE_XFORM_TEST(stbx);
        STORE_DFORM_TEST(stbu);
@@ -462,7 +461,11 @@ int test_alignment_handler_integer(void)
        STORE_XFORM_TEST(stdx);
        STORE_DFORM_TEST(stdu);
        STORE_XFORM_TEST(stdux);
+
+#ifdef __BIG_ENDIAN__
+       LOAD_DFORM_TEST(lmw);
        STORE_DFORM_TEST(stmw);
+#endif
 
        return rc;
 }