"Naveen N. Rao" [off-list ref] writes:

Michael Ellerman wrote:

quoted

Balamuruhan S [off-list ref] writes:

quoted

Avoid redefining macros to encode ppc instructions instead reuse it from
ppc-opcode.h, Makefile changes are necessary to compile memcmp_64.S with
__ASSEMBLY__ defined from selftests.

Signed-off-by: Balamuruhan S <redacted>
---
 .../selftests/powerpc/stringloops/Makefile    | 34 ++++++++++++++----
 .../powerpc/stringloops/asm/asm-const.h       |  1 +
 .../powerpc/stringloops/asm/ppc-opcode.h      | 36 +------------------
 3 files changed, 29 insertions(+), 42 deletions(-)
 create mode 120000 tools/testing/selftests/powerpc/stringloops/asm/asm-const.h
 mode change 100644 => 120000 tools/testing/selftests/powerpc/stringloops/asm/ppc-opcode.h

diff --git a/tools/testing/selftests/powerpc/stringloops/Makefile b/tools/testing/selftests/powerpc/stringloops/Makefile
index 7fc0623d85c3..efe76c5a5b94 100644
--- a/tools/testing/selftests/powerpc/stringloops/Makefile
+++ b/tools/testing/selftests/powerpc/stringloops/Makefile

@@ -1,26 +1,44 @@
 # SPDX-License-Identifier: GPL-2.0
 # The loops are all 64-bit code
-CFLAGS += -I$(CURDIR)
+GIT_VERSION = $(shell git describe --always --long --dirty || echo "unknown")
+CFLAGS += -DGIT_VERSION='"$(GIT_VERSION)"' -I$(CURDIR) -I$(CURDIR)/../include
 
 EXTRA_SOURCES := ../harness.c
 
 build_32bit = $(shell if ($(CC) $(CFLAGS) -m32 -o /dev/null memcmp.c >/dev/null 2>&1) then echo "1"; fi)
 
+ifneq ($(build_32bit),1)
 TEST_GEN_PROGS := memcmp_64 strlen
+TEST_GEN_FILES := memcmp.o memcmp_64.o memcmp_64
+MEMCMP := $(OUTPUT)/memcmp.o
+MEMCMP_64 := $(OUTPUT)/memcmp_64.o
+HARNESS :=  $(OUTPUT)/../harness.o
+CFLAGS += -m64 -maltivec
 
-$(OUTPUT)/memcmp_64: memcmp.c
-$(OUTPUT)/memcmp_64: CFLAGS += -m64 -maltivec
+OVERRIDE_TARGETS := 1
+include ../../lib.mk
 
-ifeq ($(build_32bit),1)
+$(OUTPUT)/memcmp_64: $(MEMCMP_64) $(MEMCMP) $(HARNESS)
+	$(CC) $(CFLAGS) memcmp.o memcmp_64.o ../harness.o -o memcmp_64
+
+$(MEMCMP_64): memcmp_64.S
+	$(CC) $(CFLAGS) -D__ASSEMBLY__ -o memcmp_64.o -c memcmp_64.S
+
+$(MEMCMP): memcmp.c
+	$(CC) $(CFLAGS) -o memcmp.o -c memcmp.c
+
+$(HARNESS): $(EXTRA_SOURCES)
+	$(CC) $(CFLAGS) -DGIT_VERSION='"$(GIT_VERSION)"' -o ../harness.o -c $(EXTRA_SOURCES)

What are you actually trying to do here? Is it just that you need to
define __ASSEMBLY__ for memcmp_64.S?

Adding __ASSEMBLY__ while building memcmp_64.S would be the goal, so as 
to reuse ppc-opcode.h. However, asm/ppc-opcode.h under stringloops test 
is tiny and doesn't seem to justify the change.

I don't see ppc-opcode.h testing __ASSEMBLY__ though, so I don't think
we even need to define it?

cheers