[v5,4/6] selftests/resctrl: Make resctrl_tests run using kselftest framework

In kselftest framework, all tests can be build/run at a time,
and a sub test also can be build/run individually. As follows:
$ make kselftest-all TARGETS=resctrl
$ make -C tools/testing/selftests run_tests
$ make -C tools/testing/selftests TARGETS=resctrl run_tests

However, resctrl_tests cannot be run using kselftest framework,
users have to change directory to tools/testing/selftests/resctrl/,
run "make" to build executable file "resctrl_tests",
and run "sudo ./resctrl_tests" to execute the test.

To build/run resctrl_tests using kselftest framework.
Modify tools/testing/selftests/Makefile
and tools/testing/selftests/resctrl/Makefile.

Even after this change, users can still build/run resctrl_tests
without using framework as before.

Signed-off-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
---
 tools/testing/selftests/Makefile         |  1 +
 tools/testing/selftests/resctrl/Makefile | 18 +++---------------
 2 files changed, 4 insertions(+), 15 deletions(-)

Hi Shaopeng Tan,

On 3/10/2022 11:21 PM, Shaopeng Tan wrote:
> In kselftest framework, all tests can be build/run at a time,
> and a sub test also can be build/run individually. As follows:
> $ make kselftest-all TARGETS=resctrl
> $ make -C tools/testing/selftests run_tests
> $ make -C tools/testing/selftests TARGETS=resctrl run_tests
> 
> However, resctrl_tests cannot be run using kselftest framework,
> users have to change directory to tools/testing/selftests/resctrl/,
> run "make" to build executable file "resctrl_tests",
> and run "sudo ./resctrl_tests" to execute the test.
> 
> To build/run resctrl_tests using kselftest framework.
> Modify tools/testing/selftests/Makefile
> and tools/testing/selftests/resctrl/Makefile.
> 
> Even after this change, users can still build/run resctrl_tests
> without using framework as before.
> 
> Signed-off-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
> ---
>  tools/testing/selftests/Makefile         |  1 +
>  tools/testing/selftests/resctrl/Makefile | 18 +++---------------
>  2 files changed, 4 insertions(+), 15 deletions(-)
> 
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index d08fe4cfe811..6138354b3760 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -52,6 +52,7 @@ TARGETS += proc
>  TARGETS += pstore
>  TARGETS += ptrace
>  TARGETS += openat2
> +TARGETS += resctrl
>  TARGETS += rlimits
>  TARGETS += rseq
>  TARGETS += rtc
> diff --git a/tools/testing/selftests/resctrl/Makefile b/tools/testing/selftests/resctrl/Makefile
> index 6bcee2ec91a9..30af27b07d21 100644
> --- a/tools/testing/selftests/resctrl/Makefile
> +++ b/tools/testing/selftests/resctrl/Makefile
> @@ -1,17 +1,5 @@
> -CC = $(CROSS_COMPILE)gcc
> -CFLAGS = -g -Wall -O2 -D_FORTIFY_SOURCE=2

Please do keep these CFLAGS. You can find motivation in
a9d26a302dea ("selftests/resctrl: Enable gcc checks to detect buffer overflows")

> -SRCS=$(wildcard *.c)
> -OBJS=$(SRCS:.c=.o)
> +TEST_GEN_PROGS := resctrl_tests
>  
> -all: resctrl_tests
> +include ../lib.mk
>  
> -$(OBJS): $(SRCS)
> -	$(CC) $(CFLAGS) -c $(SRCS)
> -
> -resctrl_tests: $(OBJS)
> -	$(CC) $(CFLAGS) -o $@ $^
> -
> -.PHONY: clean
> -
> -clean:
> -	$(RM) $(OBJS) resctrl_tests
> +$(OUTPUT)/resctrl_tests: $(wildcard *.c)

Reinette

On 3/11/22 12:21 PM, Shaopeng Tan wrote:
> In kselftest framework, all tests can be build/run at a time,
> and a sub test also can be build/run individually. As follows:
> $ make kselftest-all TARGETS=resctrl
> $ make -C tools/testing/selftests run_tests
> $ make -C tools/testing/selftests TARGETS=resctrl run_tests
> 
> However, resctrl_tests cannot be run using kselftest framework,
> users have to change directory to tools/testing/selftests/resctrl/,
> run "make" to build executable file "resctrl_tests",
> and run "sudo ./resctrl_tests" to execute the test.
> 
> To build/run resctrl_tests using kselftest framework.
> Modify tools/testing/selftests/Makefile
> and tools/testing/selftests/resctrl/Makefile.
> 
> Even after this change, users can still build/run resctrl_tests
> without using framework as before.
> 
> Signed-off-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
> ---
>  tools/testing/selftests/Makefile         |  1 +
>  tools/testing/selftests/resctrl/Makefile | 18 +++---------------
>  2 files changed, 4 insertions(+), 15 deletions(-)
> 
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index d08fe4cfe811..6138354b3760 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -52,6 +52,7 @@ TARGETS += proc
>  TARGETS += pstore
>  TARGETS += ptrace
>  TARGETS += openat2
> +TARGETS += resctrl
>  TARGETS += rlimits
>  TARGETS += rseq
>  TARGETS += rtc
> diff --git a/tools/testing/selftests/resctrl/Makefile b/tools/testing/selftests/resctrl/Makefile
> index 6bcee2ec91a9..30af27b07d21 100644
> --- a/tools/testing/selftests/resctrl/Makefile
> +++ b/tools/testing/selftests/resctrl/Makefile
> @@ -1,17 +1,5 @@
> -CC = $(CROSS_COMPILE)gcc
> -CFLAGS = -g -Wall -O2 -D_FORTIFY_SOURCE=2
CFLAGS = $(KHDR_INCLUDES)
Please can you add this line to build this test with kernel's latest
uapi headers always? At this moment, this isn't required. But in future
if some kernel headers are changed and this test is updated to build
with latest kernel headers, the build will start to fail when following
command will be used:
make -C tools/testing/selftests O=build

> -SRCS=$(wildcard *.c)
> -OBJS=$(SRCS:.c=.o)
> +TEST_GEN_PROGS := resctrl_tests
>  
> -all: resctrl_tests
> +include ../lib.mk
>  
> -$(OBJS): $(SRCS)
> -	$(CC) $(CFLAGS) -c $(SRCS)
> -
> -resctrl_tests: $(OBJS)
> -	$(CC) $(CFLAGS) -o $@ $^
> -
> -.PHONY: clean
> -
> -clean:
> -	$(RM) $(OBJS) resctrl_tests
> +$(OUTPUT)/resctrl_tests: $(wildcard *.c)