linux-kernel - Re: ERROR: modpost: "__popcountdi2" [lib/kunit/kunit-example-test.ko] undefined!

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Message-ID: <20240805030043.GA3417507@thelio-3990X>
Date: Sun, 4 Aug 2024 20:00:43 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: kernel test robot <lkp@...el.com>
Cc: Michal Wajdeczko <michal.wajdeczko@...el.com>, llvm@...ts.linux.dev,
	oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Shuah Khan <skhan@...uxfoundation.org>,
	David Gow <davidgow@...gle.com>
Subject: Re: ERROR: modpost: "__popcountdi2"
 [lib/kunit/kunit-example-test.ko] undefined!

On Sun, Aug 04, 2024 at 07:13:11PM +0800, kernel test robot wrote:
> Hi Michal,
> 
> First bad commit (maybe != root cause):
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   17712b7ea0756799635ba159cc773082230ed028
> commit: ee5f8cc2770b2f0f7cfefb5bf7534e2859e39485 kunit: Reset test status on each param iteration
> date:   11 months ago
> config: riscv-randconfig-001-20240804 (https://download.01.org/0day-ci/archive/20240804/202408041932.EzITeEV4-lkp@intel.com/config)
> compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 423aec6573df4424f90555468128e17073ddc69e)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240804/202408041932.EzITeEV4-lkp@intel.com/reproduce)
> 
> 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@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202408041932.EzITeEV4-lkp@intel.com/
> 
> All errors (new ones prefixed by >>, old ones prefixed by <<):
...
> >> ERROR: modpost: "__popcountdi2" [lib/kunit/kunit-example-test.ko] undefined!
> ERROR: modpost: "__popcountdi2" [lib/test_hexdump.ko] undefined!

Sorry for the noise, this appears to be a regression with tip of tree
LLVM:

https://github.com/llvm/llvm-project/pull/101786#issuecomment-2268077506

Cheers,
Nathan