linux-kernel - Re: [kbuild-all] Re: [paulmck-rcu:dev.2022.02.17a 73/73] make[3]: *** No rule to make target 'kernel/rcu/typesafe.o', needed by 'kernel/rcu/built-in.a'.

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Date:   Tue, 22 Feb 2022 06:53:49 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     "Chen, Rong A" <rong.a.chen@...el.com>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: [kbuild-all] Re: [paulmck-rcu:dev.2022.02.17a 73/73] make[3]:
 *** No rule to make target 'kernel/rcu/typesafe.o', needed by
 'kernel/rcu/built-in.a'.

On Tue, Feb 22, 2022 at 04:30:40PM +0800, Chen, Rong A wrote:
> 
> 
> On 2/22/2022 5:47 AM, Paul E. McKenney wrote:
> > On Tue, Feb 22, 2022 at 03:05:27AM +0800, kernel test robot wrote:
> > > Hi Paul,
> > > 
> > > First bad commit (maybe != root cause):
> > > 
> > > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2022.02.17a
> > > head:   f5b2eaf791ebbd6af881947ab7c40ed70681e534
> > > commit: f5b2eaf791ebbd6af881947ab7c40ed70681e534 [73/73] EXP torture: Add tests demoing SLAB_TYPESAFE_BY_RCU
> > > config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20220222/202202220308.TNib9D2v-lkp@intel.com/config)
> > > compiler: arceb-elf-gcc (GCC) 11.2.0
> > > reproduce (this is a W=1 build):
> > >          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> > >          chmod +x ~/bin/make.cross
> > >          # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=f5b2eaf791ebbd6af881947ab7c40ed70681e534
> > >          git remote add paulmck-rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
> > >          git fetch --no-tags paulmck-rcu dev.2022.02.17a
> > >          git checkout f5b2eaf791ebbd6af881947ab7c40ed70681e534
> > >          # save the config file to linux build tree
> > >          mkdir build_dir
> > >          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash
> > > 
> > > If you fix the issue, kindly add following tag as appropriate
> > > Reported-by: kernel test robot <lkp@...el.com>
> > > 
> > > All errors (new ones prefixed by >>):
> > > 
> > > > > make[3]: *** No rule to make target 'kernel/rcu/typesafe.o', needed by 'kernel/rcu/built-in.a'.
> > >     make[3]: Target '__build' not remade because of errors.
> > 
> > This is the only commit involving kernel/rcu/typesafe.o, so...
> > 
> > One the one hand, I do not plan to upstream this, so maybe it doesn't
> > matter.
> > 
> > I have been building this using the rcutorture scripting for some time,
> > same RCU-related .config as you are using.  But when I pulled it into
> > a clone in a neighboring directory, it failed just as it did for you.
> > The problem was that the update to kernel/rcu/Makefile somehow didn't
> > come across, so this line was missing:
> > 
> > 	obj-$(CONFIG_RCU_TYPESAFE_TEST) += typesafe.o
> > 
> > Which of course explains the build failure.
> > 
> > I blew away that clone and re-cloned it.  And it still failed, both
> > with "make" from the commandline and under rcutorture.
> > 
> > Hahahahahahaahaha!!!
> > 
> > I forgot "git add kernel/rcu/typesafe.c".
> > 
> > There is now a new typesafe.2022.02.21a tag with this file added.
> > 
> > Good catch!  That file happened to still be lying around.  The first
> > "git reset --hard" would have destroyed.  Thank you!!!
> > 
> > And with that fixed, my clone now builds correctly.  Does this fix
> > it for you?
> 
> Hi Paul,
> 
> I can't find the tag 'typesafe.2022.02.21a' from https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/refs/tags

That would be because I failed to push it out.  :-/

Which I just now did, apologies for my confusion.

							Thanx, Paul