linux-kernel - Re: [PATCH v2 1/2] selftests: proc: Fix proc-empty-vm build error on non x86

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Date:   Wed, 9 Nov 2022 17:20:23 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Punit Agrawal <punit.agrawal@...edance.com>,
        akpm@...ux-foundation.org, shuah@...nel.org
Cc:     adobriyan@...il.com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v2 1/2] selftests: proc: Fix proc-empty-vm build error on
 non x86_64

On 11/9/22 15:11, Punit Agrawal wrote:
> The proc-empty-vm test is implemented for x86_64 and fails to build
> for other architectures. Rather then emitting a compiler error it
> would be preferable to only build the test on supported architectures.
> 
> Mark proc-empty-vm as a test for x86_64 and customise the Makefile to
> build it only when building for this target architecture.
> 
> Fixes: 5bc73bb3451b ("proc: test how it holds up with mapping'less process")
> Signed-off-by: Punit Agrawal <punit.agrawal@...edance.com>
> ---
> v1 -> v2
> * Fixed missing compilation on x86_64
> 
> Previous version
> * https://lore.kernel.org/all/20221109110621.1791999-1-punit.agrawal@bytedance.com/
> 
> tools/testing/selftests/proc/Makefile | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile
> index cd95369254c0..743aaa0cdd52 100644
> --- a/tools/testing/selftests/proc/Makefile
> +++ b/tools/testing/selftests/proc/Makefile
> @@ -1,14 +1,16 @@
>   # SPDX-License-Identifier: GPL-2.0-only
> +
> +# When ARCH not overridden for crosscompiling, lookup machine
> +ARCH ?= $(shell uname -m 2>/dev/null || echo not)
> +
>   CFLAGS += -Wall -O2 -Wno-unused-function
>   CFLAGS += -D_GNU_SOURCE
>   LDFLAGS += -pthread
>   
> -TEST_GEN_PROGS :=
>   TEST_GEN_PROGS += fd-001-lookup
>   TEST_GEN_PROGS += fd-002-posix-eq
>   TEST_GEN_PROGS += fd-003-kthread
>   TEST_GEN_PROGS += proc-loadavg-001
> -TEST_GEN_PROGS += proc-empty-vm
>   TEST_GEN_PROGS += proc-pid-vm
>   TEST_GEN_PROGS += proc-self-map-files-001
>   TEST_GEN_PROGS += proc-self-map-files-002
> @@ -26,4 +28,8 @@ TEST_GEN_PROGS += thread-self
>   TEST_GEN_PROGS += proc-multiple-procfs
>   TEST_GEN_PROGS += proc-fsconfig-hidepid
>   
> +TEST_GEN_PROGS_x86_64 += proc-empty-vm

Why do you need this? You already have conditional compiles.
Conditionally add proc-empty-vm to TEST_GEN_PROGS like other
tests do.

> +
> +TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(ARCH))
> +
>   include ../lib.mk

Same question Andrews asked you. What does it take to get this
to work on other architectures. proc and vm tests should be
arch. agnostic as a rule unless it is absolutely necessary to
have them acrh. aware.

thanks,
-- Shuah

thanks,
-- Shuah