linux-kernel - [PATCH] selftests: Override command line in lib.mk

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Message-Id: <20250306-lib-v1-1-85692f1a7ce4@daynix.com>
Date: Thu, 06 Mar 2025 14:55:19 +0900
From: Akihiko Odaki <akihiko.odaki@...nix.com>
To: Shuah Khan <shuah@...nel.org>
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devel@...nix.com, Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH] selftests: Override command line in lib.mk

Documentation/dev-tools/kselftest.rst says you can use the "TARGETS"
variable on the make command line to run only tests targeted for a
single subsystem:

  $ make TARGETS="size timers" kselftest

A natural way to narrow down further to a particular test in a subsystem
is to specify e.g., TEST_GEN_PROGS:

  $ make TARGETS=net TEST_PROGS= TEST_GEN_PROGS=tun kselftest

However, this does not work well because the following statement in
tools/testing/selftests/lib.mk gets ignored:

  TEST_GEN_PROGS := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS))

Add the override directive to make it and similar ones will be effective
even when TEST_GEN_PROGS and similar variables are specified in the
command line.

Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
---
 tools/testing/selftests/lib.mk | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index d6edcfcb5be832ddee4c3d34b5ad221e9295f878..68116e51f97d62376c63f727ba3fd1f616c67562 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -93,9 +93,9 @@ TOOLS_INCLUDES := -isystem $(top_srcdir)/tools/include/uapi
 # TEST_PROGS are for test shell scripts.
 # TEST_CUSTOM_PROGS and TEST_PROGS will be run by common run_tests
 # and install targets. Common clean doesn't touch them.
-TEST_GEN_PROGS := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS))
-TEST_GEN_PROGS_EXTENDED := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS_EXTENDED))
-TEST_GEN_FILES := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_FILES))
+override TEST_GEN_PROGS := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS))
+override TEST_GEN_PROGS_EXTENDED := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS_EXTENDED))
+override TEST_GEN_FILES := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_FILES))
 
 all: $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES) \
 	$(if $(TEST_GEN_MODS_DIR),gen_mods_dir)

---
base-commit: dd83757f6e686a2188997cb58b5975f744bb7786
change-id: 20250306-lib-4ac9711c10a2

Best regards,
-- 
Akihiko Odaki <akihiko.odaki@...nix.com>