Re: [PATCH] selftests/futex: skip futex_numa_mpol without libnuma

[Thomas Gleixner <tglx@kernel.org>]

On Wed, Jan 28 2026 at 22:32, Nylon Chen wrote:

> Use pkg-config --exists numa to derive HAVE_LIBNUMA.
> Only keep futex_numa_mpol in TEST_GEN_PROGS when libnuma is present.
>
> Signed-off-by: Zong Li <zong.li@sifive.com>
> Signed-off-by: Nylon Chen <nylon.chen@sifive.com>
> ---
>  tools/testing/selftests/futex/functional/Makefile | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/futex/functional/Makefile b/tools/testing/selftests/futex/functional/Makefile
> index af7ec309ea78..ec3c39a51182 100644
> --- a/tools/testing/selftests/futex/functional/Makefile
> +++ b/tools/testing/selftests/futex/functional/Makefile
> @@ -1,10 +1,10 @@
>  # SPDX-License-Identifier: GPL-2.0
>  PKG_CONFIG ?= pkg-config
> +HAVE_LIBNUMA := $(shell sh -c "$(PKG_CONFIG) --exists numa > /dev/null 2>&1 && echo y")
>  LIBNUMA_TEST = $(shell sh -c "$(PKG_CONFIG) numa --atleast-version 2.0.16 > /dev/null 2>&1 && echo SUFFICIENT || echo NO")

Why another test? LIBNUMA_TEST fails when it does not exist or when the
version number is not enough. 

>  INCLUDES := -I../include -I../../ $(KHDR_INCLUDES)
>  CFLAGS := $(CFLAGS) -g -O2 -Wall -pthread -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 $(INCLUDES) $(KHDR_INCLUDES) -DLIBNUMA_VER_$(LIBNUMA_TEST)=1
> -LDLIBS := -lpthread -lrt -lnuma
>  
>  LOCAL_HDRS := \
>  	../include/futextest.h \
> @@ -27,6 +27,13 @@ TEST_GEN_PROGS := \
>  
>  TEST_PROGS := run.sh
>  
> +ifeq ($(HAVE_LIBNUMA),y)
> +LDLIBS := -lpthread -lrt -lnuma
> +else
> +LDLIBS := -lpthread -lrt
> +TEST_GEN_PROGS := $(filter-out futex_numa_mpol,$(TEST_GEN_PROGS))

Why? The test contains more than just the libnuma dependend stuff. There
are two issues here:

One is -lnuma, which is trivial to solve:

LDLIBS := -lpthread -lrt
ifeq ($(LIBNUMA_TEST),SUFFICIENT)
LDLIBS += -lnuma
endif

The other is the include <numa*.h> in the source. I assume you can
figure out how to prevent those headers from being included, right?

Thanks,

        tglx