On Wed, 2024-01-31 at 16:34 +0100, Petr Mladek wrote: > On Tue 2024-01-30 11:39:56, Marcos Paulo de Souza wrote: > > On Tue, 2024-01-30 at 07:08 +0800, kernel test robot wrote: > > > tree: > > > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > > > m > > > aster > > > head: 596764183be8ebb13352b281a442a1f1151c9b06 > > > commit: c4bbe83d27c2446a033cc0381c3fb6be5e8c41c7 [1016/2825] > > > livepatch: Move tests from lib/livepatch to selftests/livepatch > > > compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 > > > reproduce (this is a W=1 build): > > > ( > > > https://download.01.org/0day-ci/archive/20240130/202401300736.GkSZ > > > oS > > > rA-lkp@xxxxxxxxx/reproduce) > > > > > When looking at the lib.mk, I just followed the other variables and > > did > > the same: > > > > TEST_GEN_MODS_DIR := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_MODS_DIR)) > > > > But later on, I jump into $(TEST_GEN_MODS_DIR), which is invalid > > because of the O= that is used a prefix for the path: > > /tmp/kselftest/kselftest/livepatch/test_modules. My first idea was > > to > > just remove the patsubst and take TEST_GEN_MODS_DIR, which should > > be > > livepatch/test_modules in this case, but it then returns another > > problem: > > > > > > make: Entering directory > > '/home/mpdesouza/git/linux/tools/testing/selftests' > > make[1]: Entering directory > > '/home/mpdesouza/git/linux/tools/testing/selftests/livepatch' > > make -C test_modules > > make[2]: Entering directory > > '/home/mpdesouza/git/linux/tools/testing/selftests/livepatch/test_m > > odul > > > > es' > > make -C /lib/modules/6.5.9-1-default/build modules > > KBUILD_EXTMOD=/home/mpdesouza/git/linux/tools/testing/selftests/liv > > epat > > > > ch/test_modules > > Nit: There are sometimes strange empty lines between split long > lines. It looks like somehow messed cut&paste. Sorry about it. I'll double check the output next time I copy from my terminal. > > > make[3]: Entering directory '/usr/src/linux-6.5.9-1- > > obj/x86_64/default' > > make[4]: Entering directory '/tmp/kselftest' > > /usr/src/linux-6.5.9-1/Makefile:754: include/config/auto.conf: No > > such > > file or directory > > I see the same. It looks to me like a bug in kernel-devel package. > > /usr/src/linux-6.5.9-1/Makefile is from the kernel-devel package > for the running kernel. It should try to include auto.conf used > for building the running kernel: > > 1. auto.conf should be packaged in kernel-devel. > > 2. The Makefile from the kernel-devel packages should be able > to find/use auto.conf from the kernel-devel package. > > IMHO, this actually helped to find a bug that > make -C tools/testing/selftests/livepatch used auto.conf from > the git tree while the modules are built against headers > for the running kernel. > > That said, I wonder why this problem does not happen when building > external modules (KMPs). I would expect that they are using > the same Makefile from the kernel-devel package. > > Maybe the external modules somehow manage to clear "need-config" > used by /usr/src/linux-6.5.9-1/Makefile. Maybe we do not need > to include it either. > > > make[4]: *** [/usr/src/linux-6.5.9-1/Makefile:234: __sub-make] > > Error 2 > > make[4]: Leaving directory '/tmp/kselftest' > > make[3]: *** [../../../linux-6.5.9-1/Makefile:234: __sub-make] > > Error 2 > > make[3]: Leaving directory '/usr/src/linux-6.5.9-1- > > obj/x86_64/default' > > make[2]: *** [Makefile:16: modules] Error 2 > > make[2]: Leaving directory > > '/home/mpdesouza/git/linux/tools/testing/selftests/livepatch/test_m > > odul > > > > es' > > make[1]: *** [../lib.mk:92: gen_mods_dir] Error 2 > > make[1]: Leaving directory > > '/home/mpdesouza/git/linux/tools/testing/selftests/livepatch' > > make: *** [Makefile:180: all] Error 2 > > make: Leaving directory > > '/home/mpdesouza/git/linux/tools/testing/selftests' Well, this maybe be indeed a bug in kernel-devel. I added some debug messages to make (-dd), and I believe that I understood what's going wrong. First of all, if we compile an out-of-tree module, like this: make -C tools/testing/selftests/livepatch/test_modules it goes to /usr/src/linux-6.5.9-1-obj/x86_64/default, and everything works. I printed the abs_objtree and it's in fact where it should. On like 234 of the toplevel Makefile, ion the __sub-make target, it executed the make passed -C to $(abs_objtree), and -f to $(abs_srctree). abs_objtree points to /usr/src/linux-6.5.9-1- obj/x86_64/default while abs_srctree points to /usr/src/linux-6.5.9-1. Everything works. But things change whenever we use the O= argument. Its value is passed to abs_objtree, making the __sub-make to execute is a peculiar way: while abs_objtree is /tmp/kselftest, abs_srctree continues to be /usr/src/linux-6.5.9-1. That's why the include fails in this case: ifdef need-config include include/config/auto.conf endif As we are calling the include from /tmp/kselftest, and Makefile include rules try to searching for the file in the directory of it's execution[1], it fails. IIUC, all include paths on the toplevel makefile should have $(abs_srctree) as prefix, so it could work. But as Petr said, we don't have the include/config directory packaged in kernel-devel. I would like to note that this is a problem with out-of-tree module building, and not only kselftest related. If we pass O= when building a module, this will happen. For testing purposes, I added the include/{generated,config} directories into my /usr/src/linux/include, and added abs_srctree to the include mentioned above, and now it's failing with: # CC [M] /home/mpdesouza/git/linux/tools/testing/selftests/livepatch/test_module s/test_klp_atomic_replace.o gcc -Wp,- MMD,/home/mpdesouza/git/linux/tools/testing/selftests/livepatch/test_mo dules/.test_klp_atomic_replace.o.d -nostdinc -I/usr/src/linux-6.5.9- 1/arch/x86/include -I./arch/x86/include/generated -I/usr/src/linux- 6.5.9-1/include -I./include -I/usr/src/linux-6.5.9- 1/arch/x86/include/uapi -I./arch/x86/include/generated/uapi - I/usr/src/linux-6.5.9-1/include/uapi -I./include/generated/uapi - include /usr/src/linux-6.5.9-1/include/linux/compiler-version.h - include /usr/src/linux-6.5.9-1/include/linux/kconfig.h -include /usr/src/linux-6.5.9-1/include/linux/compiler_types.h -D__KERNEL__ - Werror -fmacro-prefix-map=/usr/src/linux-6.5.9-1/= -std=gnu11 -fshort- wchar -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -Wall - Wundef -Werror=implicit-function-declaration -Werror=implicit-int - Werror=return-type -Werror=strict-prototypes -Wno-format-security -Wno- trigraphs -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -fcf- protection=branch -fno-jump-tables -m64 -falign-jumps=1 -falign-loops=1 -mno-80387 -mno-fp-ret-in-387 -mpreferred-stack-boundary=3 -mskip-rax- setup -mtune=generic -mno-red-zone -mcmodel=kernel -Wno-sign-compare - fno-asynchronous-unwind-tables -mindirect-branch=thunk-extern - mindirect-branch-register -mindirect-branch-cs-prefix -mfunction- return=thunk-extern -fno-jump-tables -fpatchable-function-entry=16,16 - fno-delete-null-pointer-checks -Wno-frame-address -Wno-format- truncation -Wno-format-overflow -Wno-address-of-packed-member -O2 -fno- allow-store-data-races -Wframe-larger-than=2048 -fstack-protector- strong -Wno-main -Wno-unused-but-set-variable -Wno-unused-const- variable -Wno-dangling-pointer -ftrivial-auto-var-init=zero -fno-stack- clash-protection -pg -mrecord-mcount -mfentry -DCC_USING_FENTRY - falign-functions=16 -Wvla -Wno-pointer-sign -Wcast-function-type - fstrict-flex-arrays=3 -Wno-stringop-truncation -Wno-stringop-overflow - Wno-restrict -Wno-maybe-uninitialized -Wno-array-bounds -Wno-alloc- size-larger-than -Wimplicit-fallthrough=5 -fno-strict-overflow -fno- stack-check -fconserve-stack -Werror=date-time -Werror=incompatible- pointer-types -Werror=designated-init -Wno-packed-not-aligned -g - DMODULE -DKBUILD_BASENAME='"test_klp_atomic_replace"' - DKBUILD_MODNAME='"test_klp_atomic_replace"' - D__KBUILD_MODNAME=kmod_test_klp_atomic_replace -c -o /home/mpdesouza/git/linux/tools/testing/selftests/livepatch/test_module s/test_klp_atomic_replace.o /home/mpdesouza/git/linux/tools/testing/selftests/livepatch/test_module s/test_klp_atomic_replace.c In file included from /usr/src/linux-6.5.9- 1/include/linux/build_bug.h:5, from /usr/src/linux-6.5.9- 1/include/linux/container_of.h:5, from /usr/src/linux-6.5.9-1/include/linux/list.h:5, from /usr/src/linux-6.5.9-1/include/linux/module.h:12, from /home/mpdesouza/git/linux/tools/testing/selftests/livepatch/test_module s/test_klp_atomic_replace.c:6: /usr/src/linux-6.5.9-1/include/linux/compiler.h:246:10: fatal error: asm/rwonce.h: No such file or directory 246 | #include <asm/rwonce.h> | ^~~~~~~~~~~~~~ compilation terminated. Which seems to be missing the asm-generic targets (?). I'm not sure what to think now, if this is indeed a bug or if we should adjust other configurations. As you can see, my lack of Kbuild/Makefile knowledge is big, but I'm doing my best to understand what's wrong and how I could fix it :) What do you think about it? Thanks in advance! (I'm not sure if the output is messed up again...) [1]: https://www.gnu.org/software/make/manual/html_node/Include.html > > Best Regards, > Petr
