[PATCH] selftests/mm: report the configuration check on stderr

[PATCH] selftests/mm: report the configuration check on stderr

[Sasha Levin]

The mm Makefile includes local_config.mk, which is generated by a rule
that announces itself with "CHK [config] local_config.mk" on standard
output, which make -s does not suppress. When make has to regenerate the
file while it reads the Makefile for emit_tests, for example on a fresh
tree or when the selftests are installed with make -B, the message
becomes part of the emit_tests output that the selftests install target
appends to kselftest-list.txt, so the runlist gains a line that is not a
test.

Print the message on standard error. With V=1 the message is empty and
only the redirection of an empty command remains.

Fixes: 04cf82a741e0 ("selftests/mm: suppress compiler error in liburing check")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/mm/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index beacc0f873049..0ea72e9979347 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -266,7 +266,7 @@ $(OUTPUT)/migration: LDLIBS += -lnuma
 $(OUTPUT)/rmap: LDLIBS += -lnuma
 
 local_config.mk local_config.h_gen: check_config.sh
-	$(call msg,CHK,config,$@)
+	@{ $(patsubst @%,%,$(call msg,CHK,config,$@)) :; } >&2
 	$(Q)CC="$(CC)" CFLAGS="$(CFLAGS)" ./check_config.sh
 
 EXTRA_CLEAN += local_config.mk local_config.h_gen

base-commit: 4eb2586bd40db27d77cc5b724ca9386ed0c71d53
-- 
2.53.0