[PATCH 1/2] selftests: cgroup: build error multiple outpt files

[PATCH 1/2] selftests: cgroup: build error multiple outpt files

[Anders Roxell]

When building selftests/cgroup: with clang the following error are seen:

clang -Wall -pthread    test_memcontrol.c cgroup_util.c ../clone3/clone3_selftests.h  -o /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol
clang: error: cannot specify -o when generating multiple output files
make[3]: *** [../lib.mk:146: /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol] Error 1

Rework to add the header files to LOCAL_HDRS before including ../lib.mk,
since the dependency is evaluated in '$(OUTPUT)/%:%.c $(LOCAL_HDRS)' in
file lib.mk.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
---
 tools/testing/selftests/cgroup/Makefile | 12 +++++++-----
 tools/testing/selftests/lib.mk          |  2 +-
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
index 59e222460581..745fe25fa0b9 100644
--- a/tools/testing/selftests/cgroup/Makefile
+++ b/tools/testing/selftests/cgroup/Makefile
@@ -11,10 +11,12 @@ TEST_GEN_PROGS += test_core
 TEST_GEN_PROGS += test_freezer
 TEST_GEN_PROGS += test_kill
 
+LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
+
 include ../lib.mk
 
-$(OUTPUT)/test_memcontrol: cgroup_util.c ../clone3/clone3_selftests.h
-$(OUTPUT)/test_kmem: cgroup_util.c ../clone3/clone3_selftests.h
-$(OUTPUT)/test_core: cgroup_util.c ../clone3/clone3_selftests.h
-$(OUTPUT)/test_freezer: cgroup_util.c ../clone3/clone3_selftests.h
-$(OUTPUT)/test_kill: cgroup_util.c ../clone3/clone3_selftests.h ../pidfd/pidfd.h
+$(OUTPUT)/test_memcontrol: cgroup_util.c
+$(OUTPUT)/test_kmem: cgroup_util.c
+$(OUTPUT)/test_core: cgroup_util.c
+$(OUTPUT)/test_freezer: cgroup_util.c
+$(OUTPUT)/test_kill: cgroup_util.c
diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index fe7ee2b0f29c..a40add31a2e3 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -141,7 +141,7 @@ endif
 # Selftest makefiles can override those targets by setting
 # OVERRIDE_TARGETS = 1.
 ifeq ($(OVERRIDE_TARGETS),)
-LOCAL_HDRS := $(selfdir)/kselftest_harness.h $(selfdir)/kselftest.h
+LOCAL_HDRS += $(selfdir)/kselftest_harness.h $(selfdir)/kselftest.h
 $(OUTPUT)/%:%.c $(LOCAL_HDRS)
 	$(LINK.c) $(filter-out $(LOCAL_HDRS),$^) $(LDLIBS) -o $@
 
-- 
2.33.0

[PATCH 2/2] selftests: cgroup: use function 'labs()' over 'abs()'

[Anders Roxell]

When building selftests/cgroup with clang, the compiler warn about the
function abs() see below:

In file included from test_memcontrol.c:21:
./cgroup_util.h:16:9: warning: absolute value function 'abs' given an argument of type 'long' but has parameter of type 'int' which may cause truncation of value [-Wabsolute-value]
        return abs(a - b) <= (a + b) / 100 * err;
               ^
./cgroup_util.h:16:9: note: use function 'labs' instead
        return abs(a - b) <= (a + b) / 100 * err;
               ^~~
               labs

The note indicates what to do, Rework to use the function 'labs()'.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
---
 tools/testing/selftests/cgroup/cgroup_util.h | 2 +-
 tools/testing/selftests/cgroup/test_kmem.c   | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/cgroup/cgroup_util.h b/tools/testing/selftests/cgroup/cgroup_util.h
index 82e59cdf16e7..76b35d9dffb5 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.h
+++ b/tools/testing/selftests/cgroup/cgroup_util.h
@@ -13,7 +13,7 @@
  */
 static inline int values_close(long a, long b, int err)
 {
-	return abs(a - b) <= (a + b) / 100 * err;
+	return labs(a - b) <= (a + b) / 100 * err;
 }
 
 extern int cg_find_unified_root(char *root, size_t len);
diff --git a/tools/testing/selftests/cgroup/test_kmem.c b/tools/testing/selftests/cgroup/test_kmem.c
index 22b31ebb3513..d65bb8fe876a 100644
--- a/tools/testing/selftests/cgroup/test_kmem.c
+++ b/tools/testing/selftests/cgroup/test_kmem.c
@@ -192,7 +192,7 @@ static int test_kmem_memcg_deletion(const char *root)
 		goto cleanup;
 
 	sum = slab + anon + file + kernel_stack + pagetables + percpu + sock;
-	if (abs(sum - current) < MAX_VMSTAT_ERROR) {
+	if (labs(sum - current) < MAX_VMSTAT_ERROR) {
 		ret = KSFT_PASS;
 	} else {
 		printf("memory.current = %ld\n", current);
@@ -383,7 +383,7 @@ static int test_percpu_basic(const char *root)
 	current = cg_read_long(parent, "memory.current");
 	percpu = cg_read_key_long(parent, "memory.stat", "percpu ");
 
-	if (current > 0 && percpu > 0 && abs(current - percpu) <
+	if (current > 0 && percpu > 0 && labs(current - percpu) <
 	    MAX_VMSTAT_ERROR)
 		ret = KSFT_PASS;
 	else
-- 
2.33.0

Re: [PATCH 1/2] selftests: cgroup: build error multiple outpt files

[Nick Desaulniers]

On Fri, Nov 5, 2021 at 9:25 AM Anders Roxell <anders.roxell@linaro.org> wrote:
>
> When building selftests/cgroup: with clang the following error are seen:

Thanks for the patches!

typo in subject/oneline, and the `:` above can be dropped.

Andrew reported similar failures throughout selftests:
https://lore.kernel.org/linux-kselftest/20211005222739.2491124-1-adelg@google.com/

Both patches touch the same part of tools/testing/selftests/lib.mk.
This approach looks cleaner to me, but it should reconcile the changes
to tools/testing/selftests/filesystems/binderfs/Makefile that Andrew
made in the link above.

>
> clang -Wall -pthread    test_memcontrol.c cgroup_util.c ../clone3/clone3_selftests.h  -o /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol
> clang: error: cannot specify -o when generating multiple output files
> make[3]: *** [../lib.mk:146: /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol] Error 1
>
> Rework to add the header files to LOCAL_HDRS before including ../lib.mk,
> since the dependency is evaluated in '$(OUTPUT)/%:%.c $(LOCAL_HDRS)' in
> file lib.mk.
>
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
> ---
>  tools/testing/selftests/cgroup/Makefile | 12 +++++++-----
>  tools/testing/selftests/lib.mk          |  2 +-
>  2 files changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
> index 59e222460581..745fe25fa0b9 100644
> --- a/tools/testing/selftests/cgroup/Makefile
> +++ b/tools/testing/selftests/cgroup/Makefile
> @@ -11,10 +11,12 @@ TEST_GEN_PROGS += test_core
>  TEST_GEN_PROGS += test_freezer
>  TEST_GEN_PROGS += test_kill
>
> +LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
> +
>  include ../lib.mk
>
> -$(OUTPUT)/test_memcontrol: cgroup_util.c ../clone3/clone3_selftests.h
> -$(OUTPUT)/test_kmem: cgroup_util.c ../clone3/clone3_selftests.h
> -$(OUTPUT)/test_core: cgroup_util.c ../clone3/clone3_selftests.h
> -$(OUTPUT)/test_freezer: cgroup_util.c ../clone3/clone3_selftests.h
> -$(OUTPUT)/test_kill: cgroup_util.c ../clone3/clone3_selftests.h ../pidfd/pidfd.h
> +$(OUTPUT)/test_memcontrol: cgroup_util.c
> +$(OUTPUT)/test_kmem: cgroup_util.c
> +$(OUTPUT)/test_core: cgroup_util.c
> +$(OUTPUT)/test_freezer: cgroup_util.c
> +$(OUTPUT)/test_kill: cgroup_util.c
> diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
> index fe7ee2b0f29c..a40add31a2e3 100644
> --- a/tools/testing/selftests/lib.mk
> +++ b/tools/testing/selftests/lib.mk
> @@ -141,7 +141,7 @@ endif
>  # Selftest makefiles can override those targets by setting
>  # OVERRIDE_TARGETS = 1.
>  ifeq ($(OVERRIDE_TARGETS),)
> -LOCAL_HDRS := $(selfdir)/kselftest_harness.h $(selfdir)/kselftest.h
> +LOCAL_HDRS += $(selfdir)/kselftest_harness.h $(selfdir)/kselftest.h
>  $(OUTPUT)/%:%.c $(LOCAL_HDRS)
>         $(LINK.c) $(filter-out $(LOCAL_HDRS),$^) $(LDLIBS) -o $@
>
> --
> 2.33.0
>


-- 
Thanks,
~Nick Desaulniers

Re: [PATCH 2/2] selftests: cgroup: use function 'labs()' over 'abs()'

[Nick Desaulniers]

On Fri, Nov 5, 2021 at 9:25 AM Anders Roxell <anders.roxell@linaro.org> wrote:
>
> When building selftests/cgroup with clang, the compiler warn about the
> function abs() see below:
>
> In file included from test_memcontrol.c:21:
> ./cgroup_util.h:16:9: warning: absolute value function 'abs' given an argument of type 'long' but has parameter of type 'int' which may cause truncation of value [-Wabsolute-value]
>         return abs(a - b) <= (a + b) / 100 * err;
>                ^
> ./cgroup_util.h:16:9: note: use function 'labs' instead
>         return abs(a - b) <= (a + b) / 100 * err;
>                ^~~
>                labs
>
> The note indicates what to do, Rework to use the function 'labs()'.
>
> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>

Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

> ---
>  tools/testing/selftests/cgroup/cgroup_util.h | 2 +-
>  tools/testing/selftests/cgroup/test_kmem.c   | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/tools/testing/selftests/cgroup/cgroup_util.h b/tools/testing/selftests/cgroup/cgroup_util.h
> index 82e59cdf16e7..76b35d9dffb5 100644
> --- a/tools/testing/selftests/cgroup/cgroup_util.h
> +++ b/tools/testing/selftests/cgroup/cgroup_util.h
> @@ -13,7 +13,7 @@
>   */
>  static inline int values_close(long a, long b, int err)
>  {
> -       return abs(a - b) <= (a + b) / 100 * err;
> +       return labs(a - b) <= (a + b) / 100 * err;
>  }
>
>  extern int cg_find_unified_root(char *root, size_t len);
> diff --git a/tools/testing/selftests/cgroup/test_kmem.c b/tools/testing/selftests/cgroup/test_kmem.c
> index 22b31ebb3513..d65bb8fe876a 100644
> --- a/tools/testing/selftests/cgroup/test_kmem.c
> +++ b/tools/testing/selftests/cgroup/test_kmem.c
> @@ -192,7 +192,7 @@ static int test_kmem_memcg_deletion(const char *root)
>                 goto cleanup;
>
>         sum = slab + anon + file + kernel_stack + pagetables + percpu + sock;
> -       if (abs(sum - current) < MAX_VMSTAT_ERROR) {
> +       if (labs(sum - current) < MAX_VMSTAT_ERROR) {
>                 ret = KSFT_PASS;
>         } else {
>                 printf("memory.current = %ld\n", current);
> @@ -383,7 +383,7 @@ static int test_percpu_basic(const char *root)
>         current = cg_read_long(parent, "memory.current");
>         percpu = cg_read_key_long(parent, "memory.stat", "percpu ");
>
> -       if (current > 0 && percpu > 0 && abs(current - percpu) <
> +       if (current > 0 && percpu > 0 && labs(current - percpu) <
>             MAX_VMSTAT_ERROR)
>                 ret = KSFT_PASS;
>         else
> --
> 2.33.0
>


-- 
Thanks,
~Nick Desaulniers

Re: [PATCH 1/2] selftests: cgroup: build error multiple outpt files

[Christian Brauner]

On Fri, Nov 05, 2021 at 05:25:29PM +0100, Anders Roxell wrote:
> When building selftests/cgroup: with clang the following error are seen:
> 
> clang -Wall -pthread    test_memcontrol.c cgroup_util.c ../clone3/clone3_selftests.h  -o /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol
> clang: error: cannot specify -o when generating multiple output files
> make[3]: *** [../lib.mk:146: /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol] Error 1
> 
> Rework to add the header files to LOCAL_HDRS before including ../lib.mk,
> since the dependency is evaluated in '$(OUTPUT)/%:%.c $(LOCAL_HDRS)' in
> file lib.mk.
> 
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
> ---

Thanks!
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>

Re: [PATCH 2/2] selftests: cgroup: use function 'labs()' over 'abs()'

[Christian Brauner]

On Fri, Nov 05, 2021 at 05:25:30PM +0100, Anders Roxell wrote:
> When building selftests/cgroup with clang, the compiler warn about the
> function abs() see below:
> 
> In file included from test_memcontrol.c:21:
> ./cgroup_util.h:16:9: warning: absolute value function 'abs' given an argument of type 'long' but has parameter of type 'int' which may cause truncation of value [-Wabsolute-value]
>         return abs(a - b) <= (a + b) / 100 * err;
>                ^
> ./cgroup_util.h:16:9: note: use function 'labs' instead
>         return abs(a - b) <= (a + b) / 100 * err;
>                ^~~
>                labs
> 
> The note indicates what to do, Rework to use the function 'labs()'.
> 
> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
> ---

Thanks!
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>

Re: [PATCH 1/2] selftests: cgroup: build error multiple outpt files

[Shuah Khan]

On 11/5/21 10:25 AM, Anders Roxell wrote:
> When building selftests/cgroup: with clang the following error are seen:
> 
> clang -Wall -pthread    test_memcontrol.c cgroup_util.c ../clone3/clone3_selftests.h  -o /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol
> clang: error: cannot specify -o when generating multiple output files
> make[3]: *** [../lib.mk:146: /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol] Error 1
> 
> Rework to add the header files to LOCAL_HDRS before including ../lib.mk,
> since the dependency is evaluated in '$(OUTPUT)/%:%.c $(LOCAL_HDRS)' in
> file lib.mk.
> 
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
> ---
>   tools/testing/selftests/cgroup/Makefile | 12 +++++++-----
>   tools/testing/selftests/lib.mk          |  2 +-
>   2 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
> index 59e222460581..745fe25fa0b9 100644
> --- a/tools/testing/selftests/cgroup/Makefile
> +++ b/tools/testing/selftests/cgroup/Makefile
> @@ -11,10 +11,12 @@ TEST_GEN_PROGS += test_core
>   TEST_GEN_PROGS += test_freezer
>   TEST_GEN_PROGS += test_kill
>   
> +LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
> +

This looks odd to me. Why are we introducing dependencies between tests?
clone3 includes in cgroup? Looks odd to me.

thanks,
-- Shuah

Re: [PATCH 1/2] selftests: cgroup: build error multiple outpt files

[Christian Brauner]

On Fri, Nov 19, 2021 at 05:22:20PM -0700, Shuah Khan wrote:
> On 11/5/21 10:25 AM, Anders Roxell wrote:
> > When building selftests/cgroup: with clang the following error are seen:
> > 
> > clang -Wall -pthread    test_memcontrol.c cgroup_util.c ../clone3/clone3_selftests.h  -o /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol
> > clang: error: cannot specify -o when generating multiple output files
> > make[3]: *** [../lib.mk:146: /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol] Error 1
> > 
> > Rework to add the header files to LOCAL_HDRS before including ../lib.mk,
> > since the dependency is evaluated in '$(OUTPUT)/%:%.c $(LOCAL_HDRS)' in
> > file lib.mk.
> > 
> > Suggested-by: Arnd Bergmann <arnd@arndb.de>
> > Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
> > ---
> >   tools/testing/selftests/cgroup/Makefile | 12 +++++++-----
> >   tools/testing/selftests/lib.mk          |  2 +-
> >   2 files changed, 8 insertions(+), 6 deletions(-)
> > 
> > diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
> > index 59e222460581..745fe25fa0b9 100644
> > --- a/tools/testing/selftests/cgroup/Makefile
> > +++ b/tools/testing/selftests/cgroup/Makefile
> > @@ -11,10 +11,12 @@ TEST_GEN_PROGS += test_core
> >   TEST_GEN_PROGS += test_freezer
> >   TEST_GEN_PROGS += test_kill
> > +LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
> > +
> 
> This looks odd to me. Why are we introducing dependencies between tests?
> clone3 includes in cgroup? Looks odd to me.

The cgroup tests need access to clone3() functionality in order to test
CLONE_INTO_CGROUP which is more suited to be placed alongside the cgroup
tests. There are a few other tests that include the clone3 header.

Re: [PATCH 1/2] selftests: cgroup: build error multiple outpt files

[Shuah Khan]

On 11/23/21 7:26 AM, Christian Brauner wrote:
> On Fri, Nov 19, 2021 at 05:22:20PM -0700, Shuah Khan wrote:
>> On 11/5/21 10:25 AM, Anders Roxell wrote:
>>> When building selftests/cgroup: with clang the following error are seen:
>>>
>>> clang -Wall -pthread    test_memcontrol.c cgroup_util.c ../clone3/clone3_selftests.h  -o /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol
>>> clang: error: cannot specify -o when generating multiple output files
>>> make[3]: *** [../lib.mk:146: /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol] Error 1
>>>
>>> Rework to add the header files to LOCAL_HDRS before including ../lib.mk,
>>> since the dependency is evaluated in '$(OUTPUT)/%:%.c $(LOCAL_HDRS)' in
>>> file lib.mk.
>>>
>>> Suggested-by: Arnd Bergmann <arnd@arndb.de>
>>> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
>>> ---
>>>    tools/testing/selftests/cgroup/Makefile | 12 +++++++-----
>>>    tools/testing/selftests/lib.mk          |  2 +-
>>>    2 files changed, 8 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
>>> index 59e222460581..745fe25fa0b9 100644
>>> --- a/tools/testing/selftests/cgroup/Makefile
>>> +++ b/tools/testing/selftests/cgroup/Makefile
>>> @@ -11,10 +11,12 @@ TEST_GEN_PROGS += test_core
>>>    TEST_GEN_PROGS += test_freezer
>>>    TEST_GEN_PROGS += test_kill
>>> +LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
>>> +
>>
>> This looks odd to me. Why are we introducing dependencies between tests?
>> clone3 includes in cgroup? Looks odd to me.
> 
> The cgroup tests need access to clone3() functionality in order to test
> CLONE_INTO_CGROUP which is more suited to be placed alongside the cgroup
> tests. There are a few other tests that include the clone3 header.
> 

If other tests are also including this header, we could move it up under
selftests level. Might have to add include directory.

thanks,
-- Shuah

Re: [PATCH 1/2] selftests: cgroup: build error multiple outpt files

[Christian Brauner]

On Tue, Nov 30, 2021 at 09:41:49AM -0700, Shuah Khan wrote:
> On 11/23/21 7:26 AM, Christian Brauner wrote:
> > On Fri, Nov 19, 2021 at 05:22:20PM -0700, Shuah Khan wrote:
> > > On 11/5/21 10:25 AM, Anders Roxell wrote:
> > > > When building selftests/cgroup: with clang the following error are seen:
> > > > 
> > > > clang -Wall -pthread    test_memcontrol.c cgroup_util.c ../clone3/clone3_selftests.h  -o /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol
> > > > clang: error: cannot specify -o when generating multiple output files
> > > > make[3]: *** [../lib.mk:146: /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol] Error 1
> > > > 
> > > > Rework to add the header files to LOCAL_HDRS before including ../lib.mk,
> > > > since the dependency is evaluated in '$(OUTPUT)/%:%.c $(LOCAL_HDRS)' in
> > > > file lib.mk.
> > > > 
> > > > Suggested-by: Arnd Bergmann <arnd@arndb.de>
> > > > Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
> > > > ---
> > > >    tools/testing/selftests/cgroup/Makefile | 12 +++++++-----
> > > >    tools/testing/selftests/lib.mk          |  2 +-
> > > >    2 files changed, 8 insertions(+), 6 deletions(-)
> > > > 
> > > > diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
> > > > index 59e222460581..745fe25fa0b9 100644
> > > > --- a/tools/testing/selftests/cgroup/Makefile
> > > > +++ b/tools/testing/selftests/cgroup/Makefile
> > > > @@ -11,10 +11,12 @@ TEST_GEN_PROGS += test_core
> > > >    TEST_GEN_PROGS += test_freezer
> > > >    TEST_GEN_PROGS += test_kill
> > > > +LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
> > > > +
> > > 
> > > This looks odd to me. Why are we introducing dependencies between tests?
> > > clone3 includes in cgroup? Looks odd to me.
> > 
> > The cgroup tests need access to clone3() functionality in order to test
> > CLONE_INTO_CGROUP which is more suited to be placed alongside the cgroup
> > tests. There are a few other tests that include the clone3 header.
> > 
> 
> If other tests are also including this header, we could move it up under
> selftests level. Might have to add include directory.

No objection from me if that's useful. I won't have time for that in the
near future. (This might be of interest for one of the LF programs that
help get new folks interested in kernel development started.)

Christian

Re: [PATCH 1/2] selftests: cgroup: build error multiple outpt files

[Shuah Khan]

On 12/1/21 6:06 AM, Christian Brauner wrote:
> On Tue, Nov 30, 2021 at 09:41:49AM -0700, Shuah Khan wrote:
>> On 11/23/21 7:26 AM, Christian Brauner wrote:
>>> On Fri, Nov 19, 2021 at 05:22:20PM -0700, Shuah Khan wrote:
>>>> On 11/5/21 10:25 AM, Anders Roxell wrote:
>>>>> When building selftests/cgroup: with clang the following error are seen:
>>>>>
>>>>> clang -Wall -pthread    test_memcontrol.c cgroup_util.c ../clone3/clone3_selftests.h  -o /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol
>>>>> clang: error: cannot specify -o when generating multiple output files
>>>>> make[3]: *** [../lib.mk:146: /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol] Error 1
>>>>>
>>>>> Rework to add the header files to LOCAL_HDRS before including ../lib.mk,
>>>>> since the dependency is evaluated in '$(OUTPUT)/%:%.c $(LOCAL_HDRS)' in
>>>>> file lib.mk.
>>>>>
>>>>> Suggested-by: Arnd Bergmann <arnd@arndb.de>
>>>>> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
>>>>> ---
>>>>>     tools/testing/selftests/cgroup/Makefile | 12 +++++++-----
>>>>>     tools/testing/selftests/lib.mk          |  2 +-
>>>>>     2 files changed, 8 insertions(+), 6 deletions(-)
>>>>>
>>>>> diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
>>>>> index 59e222460581..745fe25fa0b9 100644
>>>>> --- a/tools/testing/selftests/cgroup/Makefile
>>>>> +++ b/tools/testing/selftests/cgroup/Makefile
>>>>> @@ -11,10 +11,12 @@ TEST_GEN_PROGS += test_core
>>>>>     TEST_GEN_PROGS += test_freezer
>>>>>     TEST_GEN_PROGS += test_kill
>>>>> +LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
>>>>> +
>>>>
>>>> This looks odd to me. Why are we introducing dependencies between tests?
>>>> clone3 includes in cgroup? Looks odd to me.
>>>
>>> The cgroup tests need access to clone3() functionality in order to test
>>> CLONE_INTO_CGROUP which is more suited to be placed alongside the cgroup
>>> tests. There are a few other tests that include the clone3 header.
>>>
>>
>> If other tests are also including this header, we could move it up under
>> selftests level. Might have to add include directory.
> 
> No objection from me if that's useful. I won't have time for that in the
> near future. (This might be of interest for one of the LF programs that
> help get new folks interested in kernel development started.)
> 
> Christian
> 

Thanks. I will apply this fix for now.

thanks,
-- Shuah