linux-kernel - Re: WARNING: modpost: vmlinux: section mismatch in reference: bitmap_gather+0x68 (section: .text) -> sg

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Message-ID: <ZrzcAnHNXDF2Ck6K@smile.fi.intel.com>
Date: Wed, 14 Aug 2024 19:32:02 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: kernel test robot <lkp@...el.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Yury Norov <yury.norov@...il.com>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Herve Codina <herve.codina@...tlin.com>
Subject: Re: WARNING: modpost: vmlinux: section mismatch in reference:
 bitmap_gather+0x68 (section: .text) -> sg_mask (section: .init.rodata)

+Cc: Clang and bitmap people.

On Thu, Jun 20, 2024 at 08:54:29AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   e5b3efbe1ab1793bb49ae07d56d0973267e65112
> commit: de5f84338970815b9fdd3497a975fb572d11e0b5 lib/bitmap: Introduce bitmap_scatter() and bitmap_gather() helpers
> date:   3 months ago
> config: um-randconfig-r123-20240620 (https://download.01.org/0day-ci/archive/20240620/202406200829.IytwLyQJ-lkp@intel.com/config)
> compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 78ee473784e5ef6f0b19ce4cb111fb6e4d23c6b2)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240620/202406200829.IytwLyQJ-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/202406200829.IytwLyQJ-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
> 
> WARNING: modpost: missing MODULE_DESCRIPTION() in vmlinux.o
> >> WARNING: modpost: vmlinux: section mismatch in reference: bitmap_gather+0x68 (section: .text) -> sg_mask (section: .init.rodata)
> WARNING: modpost: vmlinux: section mismatch in reference: bitmap_gather+0x10b (section: .text) -> sg_mask (section: .init.rodata)
> >> WARNING: modpost: vmlinux: section mismatch in reference: bitmap_scatter+0x68 (section: .text) -> sg_mask (section: .init.rodata)
> WARNING: modpost: vmlinux: section mismatch in reference: bitmap_scatter+0x119 (section: .text) -> sg_mask (section: .init.rodata)

I have no other idea that this is a (yet another) clang compiler bug related to
the constant data.

-- 
With Best Regards,
Andy Shevchenko