[PATCH 1/2] selftests: keep consistency for uname -m usage

[Fathi Boudra]

powerpc selftests allow to override ARCH for cross-compilation by making
the first ARCH assignment weak.
Use the same approach in breakpoints, ipc and prctl tests to:
 - keep uname usage consistent across selftests
 - make it easier to cross-compile

Signed-off-by: Fathi Boudra <fathi.boudra@xxxxxxxxxx>
---
 tools/testing/selftests/breakpoints/Makefile | 4 ++--
 tools/testing/selftests/ipc/Makefile         | 4 ++--
 tools/testing/selftests/powerpc/Makefile     | 2 +-
 tools/testing/selftests/prctl/Makefile       | 4 ++--
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/breakpoints/Makefile b/tools/testing/selftests/breakpoints/Makefile
index 72aa103e4141..9d5a1af4b5c9 100644
--- a/tools/testing/selftests/breakpoints/Makefile
+++ b/tools/testing/selftests/breakpoints/Makefile
@@ -1,6 +1,6 @@
 # Taken from perf makefile
-uname_M := $(shell uname -m 2>/dev/null || echo not)
-ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
+ARCH ?= $(shell uname -m 2>/dev/null || echo not)
+ARCH := $(shell echo $(ARCH) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
 
 ifeq ($(ARCH),x86)
 TEST_GEN_PROGS := breakpoint_test
diff --git a/tools/testing/selftests/ipc/Makefile b/tools/testing/selftests/ipc/Makefile
index 30ef4c7f53ea..7e5a459842bb 100644
--- a/tools/testing/selftests/ipc/Makefile
+++ b/tools/testing/selftests/ipc/Makefile
@@ -1,5 +1,5 @@
-uname_M := $(shell uname -m 2>/dev/null || echo not)
-ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/i386/)
+ARCH ?= $(shell uname -m 2>/dev/null || echo not)
+ARCH := $(shell echo $(ARCH) | sed -e s/i.86/i386/)
 ifeq ($(ARCH),i386)
         ARCH := x86
 	CFLAGS := -DCONFIG_X86_32 -D__i386__
diff --git a/tools/testing/selftests/powerpc/Makefile b/tools/testing/selftests/powerpc/Makefile
index 1c5d0575802e..731e015d170d 100644
--- a/tools/testing/selftests/powerpc/Makefile
+++ b/tools/testing/selftests/powerpc/Makefile
@@ -1,7 +1,7 @@
 # Makefile for powerpc selftests
 
 # ARCH can be overridden by the user for cross compiling
-ARCH ?= $(shell uname -m)
+ARCH ?= $(shell uname -m 2>/dev/null || echo not)
 ARCH := $(shell echo $(ARCH) | sed -e s/ppc.*/powerpc/)
 
 ifeq ($(ARCH),powerpc)
diff --git a/tools/testing/selftests/prctl/Makefile b/tools/testing/selftests/prctl/Makefile
index 35aa1c8f2df2..08aeb8721ce6 100644
--- a/tools/testing/selftests/prctl/Makefile
+++ b/tools/testing/selftests/prctl/Makefile
@@ -1,6 +1,6 @@
 ifndef CROSS_COMPILE
-uname_M := $(shell uname -m 2>/dev/null || echo not)
-ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
+ARCH ?= $(shell uname -m 2>/dev/null || echo not)
+ARCH := $(shell echo $(ARCH) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
 
 ifeq ($(ARCH),x86)
 TEST_PROGS := disable-tsc-ctxt-sw-stress-test disable-tsc-on-off-stress-test \
-- 
2.11.0