On 4/24/20 11:28 AM, Bird, Tim wrote:
-----Original Message-----
From: linux-kselftest-owner@xxxxxxxxxxxxxxx <linux-kselftest-owner@xxxxxxxxxxxxxxx> On Behalf Of Randy Dunlap
On 4/14/20 2:22 PM, Shuah Khan wrote:
-CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/ $(MOUNT_CFLAGS)
-LDLIBS += $(MOUNT_LDLIBS)
+CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/ $(VAR_CFLAGS)
+LDLIBS += $(VAR_LDLIBS)
(1) Can that series of ../../../.. be replaced by $(objtree)?
If so, that would be much cleaner IMO.
kselftests doesn't set $(objtree) when it is run directly
(ie make -C tools/testing/selftests)
I had my own solution which was to use KBUILD_OUTPUT, like so:
This was a patch in my queue, that I didn't send in because I wasn't
very happy with it. I was still considering alternatives.
---------------- (patch)
Subject: [PATCH] selftests/vm: use includes from KBUILD_OUTPUT directory
The Makefile for the vm tests was specifying a relative path
(in the source directory) for accessing include files. This
doesn't work when the headers files are placed in another
directory (with O= or KBUILD_OUTPUT). It may appear to work,
but ends up using includes from the host machine, which may
not match the kernel source being compiled against.
Without this change, when the program userfaultfd.c was
compiled, it generated errors like the following:
userfaultfd.c:267:21: error: 'UFFD_API_RANGE_IOCTLS_BASIC' undeclared
here (not in a function)
.expected_ioctls = UFFD_API_RANGE_IOCTLS_BASIC,
^~~~~~~~~~~~~~~~~~~~~~~~~~~
userfaultfd.c: In function 'uffd_poll_thread':
userfaultfd.c:529:8: error: 'UFFD_EVENT_FORK' undeclared (first use in
this function)
case UFFD_EVENT_FORK:
^~~~~~~~~~~~~~~
userfaultfd.c:529:8: note: each undeclared identifier is reported only
once for each function it appears in
userfaultfd.c:531:18: error: 'union <anonymous>' has no member named
'fork'
uffd = msg.arg.fork.ufd;
^
Change the CFLAGS definition in the Makefile to reference
KBUILD_OUTPUT.
Signed-off-by: Tim Bird <tim.bird@xxxxxxxx>
---
tools/testing/selftests/vm/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index 7f9a8a8..0208659 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -3,7 +3,7 @@
uname_M := $(shell uname -m 2>/dev/null || echo not)
ARCH ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/')
-CFLAGS = -Wall -I ../../../../usr/include $(EXTRA_CFLAGS)
+CFLAGS = -Wall -I $(KBUILD_OUTPUT)/usr/include $(EXTRA_CFLAGS)
LDLIBS = -lrt
TEST_GEN_FILES = compaction_test
TEST_GEN_FILES += gup_benchmark
This should be $(OUTPUT) instead of $(KBUILD_OUTPUT). OUTPUT is
set by selftests Makefile and lib.mk which is common for all
tests even when make -C is used for compile.
Using KBUILD_OUTPUT will break other use-cases.
Send me the patch when you are ready.
kselftest Makefile invokes headers_install from the main Makefile.
This sequence doesn't install headers again when kselftest make
is done:
Main directory:
# make headers_install
[headers_install runs]
# make headers_install
INSTALL ./usr/include
[does nothing - headers are there]
make kselftest-all
make --no-builtin-rules ARCH=x86 -C ../../.. headers_install
make[2]: Entering directory '/home/shuah/lkml/linux_5.7'
INSTALL ./usr/include
[Same here - headers aren't installed]
I didn't check O= and KBUILD_OUTPUT cases though.
thanks,
-- Shuah
