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:   Thu, 3 Mar 2022 08:30:28 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     paulmck@...nel.org
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 3/3/2022 5:38 AM, Paul E. McKenney wrote:
> On Wed, Feb 23, 2022 at 06:14:52PM +0800, Chen, Rong A wrote:
>>
>>
>> On 2/22/2022 10:53 PM, Paul E. McKenney wrote:
>>> 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
>>
>> Hi Paul,
>>
>> I have tested the tag, yes, it's fixed.
> 
> Very good, and thank you!
> 
> May I add your Tested-by?
> 
> 							Thanx, Paul
> 

Sure, Tested-by: "kernel test robot" <rong.a.chen@...el.com>

Best Regards,
Rong Chen