linux-kernel - Re: ERROR: modpost: "__popcountsi2" [fs/bcachefs/bcachefs.ko] undefined!

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Message-ID: <20240807153616.GA2942016@thelio-3990X>
Date: Wed, 7 Aug 2024 08:36:16 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: kernel test robot <lkp@...el.com>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>, llvm@...ts.linux.dev,
	oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: ERROR: modpost: "__popcountsi2" [fs/bcachefs/bcachefs.ko]
 undefined!

On Wed, Aug 07, 2024 at 04:43:13AM +0800, kernel test robot wrote:
> Hi Kent,
> 
> First bad commit (maybe != root cause):
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   eb5e56d1491297e0881c95824e2050b7c205f0d4
> commit: 9ae82fe6ace1b267005758ccfb2347a4a6aa4398 bcachefs: Inline make_bfloat() into __build_ro_aux_tree()
> date:   10 months ago
> config: arm-randconfig-002-20240805 (https://download.01.org/0day-ci/archive/20240807/202408070432.X6n56VaY-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/20240807/202408070432.X6n56VaY-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/202408070432.X6n56VaY-lkp@intel.com/
> 
> All errors (new ones prefixed by >>, old ones prefixed by <<):
...
> ERROR: modpost: "__popcountsi2" [fs/ext4/ext4.ko] undefined!
> ERROR: modpost: "__popcountsi2" [fs/fat/fat.ko] undefined!
> ERROR: modpost: "__popcountsi2" [fs/hfsplus/hfsplus.ko] undefined!
> ERROR: modpost: "__popcountsi2" [fs/xfs/xfs.ko] undefined!
> ERROR: modpost: "__popcountsi2" [fs/gfs2/gfs2.ko] undefined!
> >> ERROR: modpost: "__popcountsi2" [fs/bcachefs/bcachefs.ko] undefined!
> ERROR: modpost: "__aeabi_uldivmod" [fs/bcachefs/bcachefs.ko] undefined!
> ERROR: modpost: "__popcountsi2" [drivers/block/virtio_blk.ko] undefined!
> ERROR: modpost: "__popcountsi2" [drivers/net/ipa/ipa.ko] undefined!
> ERROR: modpost: "__popcountsi2" [drivers/memory/emif.ko] undefined!
> WARNING: modpost: suppressed 5 unresolved symbol warnings because there were too many)

Intel folks, can you upgrade your build of Clang main to
https://github.com/llvm/llvm-project/commit/4527fba9ad6bc682eceda603150bfaec65ec6916?
The current revision is broken and unrelated changes are getting
notified. There might be one more regression that I am looking into, so
consider not going further than that revision.

Cheers,
Nathan