[PATCH 2/3] selftest/powerpc: Add flags.mk to support pmu buildable

[Sachin Sant]

> On 29-Feb-2024, at 3:07 PM, Madhavan Srinivasan <maddy at linux.ibm.com> wrote:
> 
> When running `make -C powerpc/pmu run_tests` from top level selftests
> directory, currently this error is being reported
> 
> make: Entering directory '/home/maddy/linux/tools/testing/selftests/powerpc/pmu'
> Makefile:40: warning: overriding recipe for target 'emit_tests'
> ../../lib.mk:111: warning: ignoring old recipe for target 'emit_tests'
> gcc -m64    count_instructions.c ../harness.c event.c lib.c ../utils.c loop.S  -o /home/maddy/selftest_output//count_instructions
> In file included from count_instructions.c:13:
> event.h:12:10: fatal error: utils.h: No such file or directory
> 12 | #include "utils.h"
>  |          ^~~~~~~~~
> compilation terminated.
> 
> This is due to missing of include path in CFLAGS. That is, CFLAGS and
> GIT_VERSION macros are defined in the powerpc/ folder Makefile which
> in this case not involved.
> 
> To address the failure incase of executing specific sub-folder test directly,
> a new rule file has been addded by the patch called "flags.mk" under
> selftest/powerpc/ folder and is linked to all the Makefile of powerpc/pmu
> sub-folders.
> 
> Reported-by: Sachin Sant <sachinp at linux.ibm.com>
> Signed-off-by: Madhavan Srinivasan <maddy at linux.ibm.com>
> ---

Fixes the reported problem for me.

Tested-by: Sachin Sant <sachinp at linux.ibm.com>

While at it, FWIW I have also tested the remaining 2 patches and
no problems were seen.

For the other 2 patches in the series

Tested-by: Sachin Sant <sachinp at linux.ibm.com>

— Sachin