This is a note to let you know that I've just added the patch titled
selftests/binderfs: use the Makefile's rules, not Make's implicit rules
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-binderfs-use-the-makefile-s-rules-not-make.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f7896b7d5c82b1fe18b33cc4fbb8ca1710392c20
Author: John Hubbard <jhubbard@xxxxxxxxxx>
Date: Thu May 2 18:58:20 2024 -0700
selftests/binderfs: use the Makefile's rules, not Make's implicit rules
[ Upstream commit 019baf635eb6ffe8d6c1343f81788f02a7e0ed98 ]
First of all, in order to build with clang at all, one must first apply
Valentin Obst's build fix for LLVM [1]. Once that is done, then when
building with clang, via:
make LLVM=1 -C tools/testing/selftests
...the following error occurs:
clang: error: cannot specify -o when generating multiple output files
This is because clang, unlike gcc, won't accept invocations of this
form:
clang file1.c header2.h
While trying to fix this, I noticed that:
a) selftests/lib.mk already avoids the problem, and
b) The binderfs Makefile indavertently bypasses the selftests/lib.mk
build system, and quitely uses Make's implicit build rules for .c files
instead.
The Makefile attempts to set up both a dependency and a source file,
neither of which was needed, because lib.mk is able to automatically
handle both. This line:
binderfs_test: binderfs_test.c
...causes Make's implicit rules to run, which builds binderfs_test
without ever looking at lib.mk.
Fix this by simply deleting the "binderfs_test:" Makefile target and
letting lib.mk handle it instead.
[1] https://lore.kernel.org/all/20240329-selftests-libmk-llvm-rfc-v1-1-2f9ed7d1c49f@xxxxxxxxxxxxxxx/
Fixes: 6e29225af902 ("binderfs: port tests to test harness infrastructure")
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/filesystems/binderfs/Makefile b/tools/testing/selftests/filesystems/binderfs/Makefile
index 8af25ae960498..24d8910c7ab58 100644
--- a/tools/testing/selftests/filesystems/binderfs/Makefile
+++ b/tools/testing/selftests/filesystems/binderfs/Makefile
@@ -3,6 +3,4 @@
CFLAGS += -I../../../../../usr/include/ -pthread
TEST_GEN_PROGS := binderfs_test
-binderfs_test: binderfs_test.c ../../kselftest.h ../../kselftest_harness.h
-
include ../../lib.mk
