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

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Date:   Fri, 17 Mar 2017 14:48:23 +0200
From:   Fathi Boudra <fathi.boudra@...aro.org>
To:     Shuah Khan <shuah@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 1/2] selftests: keep consistency for uname -m usage

On 15 March 2017 at 17:56, Shuah Khan <shuah@...nel.org> wrote:
> Hi Fathi,
>
> On 03/15/2017 07:15 AM, Fathi Boudra wrote:
>> 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
>
> How does it make it easier to cross-compile? Could you please
> elaborate on what this patch is fixing?

Nevermind, ARCH was already a weak assignment. My patches changed the behavior.
I've been confused by the different approach used by powerpc vs
breakpoints/ipc/prctl tests.

> Also I would like to see 3 separate patches one for each
> of the tests?

Will you accept a patch to get rid on uname_M variable, keep ARCH
usage consistent across selftests?
In other words, align with the way it's done in powerpc test.
It won't fix any cross-compilation issues but improve consistency in the code.

> thanks,
> -- Shuah
>
>>
>> Signed-off-by: Fathi Boudra <fathi.boudra@...aro.org>
>> ---
>>  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 \
>>
>