[bug report] selftests: futex: warning during build with multiple jobs

[bug report] selftests: futex: warning during build with multiple jobs

[Muhammad Usama Anjum]

Hi,

On linux-next
cd tools/testing/selftests/futex && make clean -j 32
gives warning
make[1]: warning: jobserver unavailable: using -j1.  Add '+' to parent
make rule.
The full logs with with different reproduction steps can be found here:
https://storage.staging.kernelci.org/next/master/next-20220310/x86_64/x86_64_defconfig+kselftest/gcc-10/logs/kselftest.log.
Usually this type of warning shouldn't come when $MAKE is being used
instead of make in Makefile.

Maybe `define CLEAN` inside override construct defined in parent
makefile is not getting jobsever information when child make process
executes. I've enabled verbose mode and tried with other makefile flags
(-p, -d etc) as well. Documentation mentions that if make is unable to
identify the child process correctly, this warning will appear.

Please share if you have any thoughts on it.

-- 
Muhammad Usama Anjum

Re: [bug report] selftests: futex: warning during build with multiple jobs

[Shuah Khan]

On 3/13/22 10:09 AM, Muhammad Usama Anjum wrote:
> Hi,
> 
> On linux-next
> cd tools/testing/selftests/futex && make clean -j 32
> gives warning
> make[1]: warning: jobserver unavailable: using -j1.  Add '+' to parent
> make rule.
> The full logs with with different reproduction steps can be found here:
> https://storage.staging.kernelci.org/next/master/next-20220310/x86_64/x86_64_defconfig+kselftest/gcc-10/logs/kselftest.log.
> Usually this type of warning shouldn't come when $MAKE is being used
> instead of make in Makefile.
> 
> Maybe `define CLEAN` inside override construct defined in parent
> makefile is not getting jobsever information when child make process
> executes. I've enabled verbose mode and tried with other makefile flags
> (-p, -d etc) as well. Documentation mentions that if make is unable to
> identify the child process correctly, this warning will appear.
> 
> Please share if you have any thoughts on it.
> 

futex test defines its own clean to catch all the sub-directories
overriding common clean. Changing it not override won't do the
clean properly.

Propose a fix that works for -j build as well keeping override in
place.

thanks,
-- Shuah