Re: make[5]: *** No rule to make target 'scripts/module.lds', needed by 'tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.ko'.

["Liu, Yujie" <yujie.liu@intel.com>]

Hi Sergei,

On Wed, 2023-06-07 at 22:47 +0100, Sergei Trofimovich wrote:
> On Thu, 8 Jun 2023 05:24:07 +0800
> kernel test robot <lkp@intel.com> wrote:
> 
> > Hi Sergei,
> > 
> > First bad commit (maybe != root cause):
> > 
> > tree:  
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
> > master
> > head:   a27648c742104a833a01c54becc24429898d85bf
> > commit: 82880283d7fcd0a1d20964a56d6d1a5cc0df0713 objtool: Fix
> > truncated string warning
> > date:   1 year, 4 months ago
> > compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> > reproduce:
> >         #
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=82880283d7fcd0a1d20964a56d6d1a5cc0df0713
> >         git remote add linus
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >         git fetch --no-tags linus master
> >         git checkout 82880283d7fcd0a1d20964a56d6d1a5cc0df0713
> >         make W=1 O=/tmp/kselftest headers
> >         make W=1 O=/tmp/kselftest -C tools/testing/selftests
> >         make W=1 O=/tmp/kselftest -C tools/testing/selftests/bpf
> > 
> > If you fix the issue in a separate patch/commit (i.e. not just a
> > new version of
> > the same patch/commit), kindly add following tags
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Closes:
> > > https://lore.kernel.org/oe-kbuild-all/202306080543.EJWQZYkE-lkp@intel.com/
> > 
> > All error/warnings (new ones prefixed by >>):
> > 
> > > > tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:19:1:
> > > > warning: no previous prototype for 'bpf_testmod_test_mod_kfunc'
> > > > [-Wmissing-prototypes]  
> >       19 | bpf_testmod_test_mod_kfunc(int i)
> >          | ^~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:24:14:
> > > > warning: no previous prototype for 'bpf_testmod_loop_test' [-
> > > > Wmissing-prototypes]  
> >       24 | noinline int bpf_testmod_loop_test(int n)
> >          |              ^~~~~~~~~~~~~~~~~~~~~
> > > > tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:36:30:
> > > > warning: no previous prototype for 'bpf_testmod_return_ptr' [-
> > > > Wmissing-prototypes]  
> >       36 | __weak noinline struct file *bpf_testmod_return_ptr(int
> > arg)
> >          |                              ^~~~~~~~~~~~~~~~~~~~~~
> >    tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:53:1:
> > warning: no previous prototype for 'bpf_testmod_test_read' [-
> > Wmissing-prototypes]
> >       53 | bpf_testmod_test_read(struct file *file, struct kobject
> > *kobj,
> >          | ^~~~~~~~~~~~~~~~~~~~~
> >    tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c:89:1:
> > warning: no previous prototype for 'bpf_testmod_test_write' [-
> > Wmissing-prototypes]
> >       89 | bpf_testmod_test_write(struct file *file, struct kobject
> > *kobj,
> >          | ^~~~~~~~~~~~~~~~~~~~~~
> > --
> > > > make[5]: *** No rule to make target 'scripts/module.lds',
> > > > needed by
> > > > 'tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.ko'.  
> >    make[5]: Target '__modfinal' not remade because of errors.
> 
> This failure looks unrelated to the commit it points to.
> 
> lkp@, can you have a look at your bisection rules in a bit
> more of detail? There are at least 2 problems with this report:
> 
> 1. the commit is 1.5 years old, it's unlikely you care about that old
> material
> 2. build failure might be an indication of a flaky build failure (or
> outright
>    stale build tree)
> 
> Both points have a chance of decreasing signal value from 0-DAY CI.

Really sorry for this false report. There was an environment issue in
the bot and caused a wrong bisection. We are working on fixing it.

Sorry again for the noise.


--
Best Regards,
Yujie