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Message-ID: <aN7RTSbXDA32J8D2@orbyte.nwl.cc>
Date: Thu, 2 Oct 2025 21:23:57 +0200
From: Phil Sutter <phil@....cc>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
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Subject: Re: [PATCH net] selftests: net: unify the Makefile formats
Hi Jakub,
On Wed, Oct 01, 2025 at 06:30:33PM -0700, Jakub Kicinski wrote:
> We get a significant number of conflicts between net and net-next
> because of selftests Makefile changes. People tend to append new
> test cases at the end of the Makefile when there's no clear sort
> order. Sort all networking selftests Makefiles, use the following
> format:
>
> VAR_NAME := \
> entry1 \
> entry2 \
> entry3 \
> # end of VAR_NAME
A potential problem with this format is loss of context with long lists.
While I don't think it will cause incorrect conflict resolutions,
appending via '+=' may ease reviews of patches:
VAR_NAME :=
VAR_NAME += entry1
VAR_NAME += entry2
VAR_NAME += entry3
No trailing comment needed this way. Downside is '?=' can't be used.
> Some Makefiles are already pretty close to this.
Which is a point to stick with it.
[...]
> diff --git a/tools/testing/selftests/drivers/net/netdevsim/Makefile b/tools/testing/selftests/drivers/net/netdevsim/Makefile
> index 07b7c46d3311..daf51113c827 100644
> --- a/tools/testing/selftests/drivers/net/netdevsim/Makefile
> +++ b/tools/testing/selftests/drivers/net/netdevsim/Makefile
> @@ -1,6 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0+ OR MIT
>
> -TEST_PROGS = devlink.sh \
> +TEST_PROGS := \
Maybe irrelevant, but assignment type changes should be avoided IMO
(there are more cases like this one).
> + devlink.sh \
> devlink_in_netns.sh \
> devlink_trap.sh \
> ethtool-coalesce.sh \
> @@ -17,5 +18,6 @@ TEST_PROGS = devlink.sh \
> psample.sh \
> tc-mq-visibility.sh \
> udp_tunnel_nic.sh \
> +# end of TEST_PROGS
>
> include ../../../lib.mk
[...]
> diff --git a/tools/testing/selftests/drivers/net/virtio_net/Makefile b/tools/testing/selftests/drivers/net/virtio_net/Makefile
> index 7ec7cd3ab2cc..868ece3fea1f 100644
> --- a/tools/testing/selftests/drivers/net/virtio_net/Makefile
> +++ b/tools/testing/selftests/drivers/net/virtio_net/Makefile
> @@ -1,15 +1,12 @@
> # SPDX-License-Identifier: GPL-2.0+ OR MIT
>
> -TEST_PROGS = basic_features.sh \
> - #
> +TEST_PROGS = basic_features.sh
>
> -TEST_FILES = \
> - virtio_net_common.sh \
> - #
> +TEST_FILES = virtio_net_common.sh
These seem intentional, so change to the syntax as proposed?
[...]
> diff --git a/tools/testing/selftests/net/lib/Makefile b/tools/testing/selftests/net/lib/Makefile
> index 88c4bc461459..ce795bc0a1af 100644
> --- a/tools/testing/selftests/net/lib/Makefile
> +++ b/tools/testing/selftests/net/lib/Makefile
> @@ -5,12 +5,16 @@ CFLAGS += -I../../../../../usr/include/ $(KHDR_INCLUDES)
> # Additional include paths needed by kselftest.h
> CFLAGS += -I../../
>
> -TEST_FILES := ../../../../../Documentation/netlink/specs
> -TEST_FILES += ../../../../net/ynl
> +TEST_FILES := \
> + ../../../../net/ynl \
> + ../../../../../Documentation/netlink/specs \
> +# end of TEST_FILES
>
> -TEST_GEN_FILES += csum
> -TEST_GEN_FILES += $(patsubst %.c,%.o,$(wildcard *.bpf.c))
> -TEST_GEN_FILES += xdp_helper
> +TEST_GEN_FILES := \
> + $(patsubst %.c,%.o,$(wildcard *.bpf.c)) \
> + csum \
> + xdp_helper \
> +# end of TEST_GEN_FILES
This one is interesting, the old code appended only, new code might
overwrite existing content.
Cheers, Phil
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