[thomas-weissschuh:b4/at-vector-size-arch 2/24] ERROR: modpost: "__bswapsi2" [fs/ecryptfs/ecryptfs.ko] undefined!

[thomas-weissschuh:b4/at-vector-size-arch 2/24] ERROR: modpost: "__bswapsi2" [fs/ecryptfs/ecryptfs.ko] undefined!

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/at-vector-size-arch
head:   48790f0896dc14ed71a371b1a81ecd5c32347185
commit: 7ad4197ef8bdb56c2e4b411acc9bb311e91f6350 [2/24] ARC: Always use SWAPE instructions and enable ARCH_USE_BUILTIN_BSWAP
config: arc-randconfig-001-20260113 (https://download.01.org/0day-ci/archive/20260113/202601131142.f4Kyqt82-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260113/202601131142.f4Kyqt82-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601131142.f4Kyqt82-lkp@intel.com/

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "__bswapsi2" [fs/ecryptfs/ecryptfs.ko] undefined!
>> ERROR: modpost: "__bswapdi2" [fs/ecryptfs/ecryptfs.ko] undefined!
>> ERROR: modpost: "__bswapsi2" [security/keys/trusted-keys/trusted.ko] undefined!
>> ERROR: modpost: "__bswapdi2" [crypto/wp512.ko] undefined!
>> ERROR: modpost: "__bswapsi2" [drivers/pinctrl/pinctrl-single.ko] undefined!
>> ERROR: modpost: "__bswapsi2" [drivers/video/backlight/qcom-wled.ko] undefined!
>> ERROR: modpost: "__bswapsi2" [drivers/video/fbdev/core/cfbfillrect.ko] undefined!
>> ERROR: modpost: "__bswapsi2" [drivers/video/fbdev/core/cfbcopyarea.ko] undefined!
>> ERROR: modpost: "__bswapsi2" [drivers/video/fbdev/core/cfbimgblt.ko] undefined!
>> ERROR: modpost: "__bswapsi2" [drivers/video/fbdev/core/sysfillrect.ko] undefined!
WARNING: modpost: suppressed 92 unresolved symbol warnings because there were too many)

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for CAN_DEV
   Depends on [n]: NETDEVICES [=n] && CAN [=y]
   Selected by [y]:
   - CAN [=y] && NET [=y]

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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Re: [thomas-weissschuh:b4/at-vector-size-arch 2/24] ERROR: modpost: "__bswapsi2" [fs/ecryptfs/ecryptfs.ko] undefined!

[Vineet Gupta]

On 1/12/26 19:20, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/at-vector-size-arch
> head:   48790f0896dc14ed71a371b1a81ecd5c32347185
> commit: 7ad4197ef8bdb56c2e4b411acc9bb311e91f6350 [2/24] ARC: Always use SWAPE instructions and enable ARCH_USE_BUILTIN_BSWAP
> config: arc-randconfig-001-20260113 (https://download.01.org/0day-ci/archive/20260113/202601131142.f4Kyqt82-lkp@intel.com/config)
> compiler: arc-linux-gcc (GCC) 8.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260113/202601131142.f4Kyqt82-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@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202601131142.f4Kyqt82-lkp@intel.com/
>
> All errors (new ones prefixed by >>, old ones prefixed by <<):
>
>>> ERROR: modpost: "__bswapsi2" [fs/ecryptfs/ecryptfs.ko] undefined!
>>> ERROR: modpost: "__bswapdi2" [fs/ecryptfs/ecryptfs.ko] undefined!
>>> ERROR: modpost: "__bswapsi2" [security/keys/trusted-keys/trusted.ko] undefined!
>>> ERROR: modpost: "__bswapdi2" [crypto/wp512.ko] undefined!
>>> ERROR: modpost: "__bswapsi2" [drivers/pinctrl/pinctrl-single.ko] undefined!
>>> ERROR: modpost: "__bswapsi2" [drivers/video/backlight/qcom-wled.ko] undefined!
>>> ERROR: modpost: "__bswapsi2" [drivers/video/fbdev/core/cfbfillrect.ko] undefined!
>>> ERROR: modpost: "__bswapsi2" [drivers/video/fbdev/core/cfbcopyarea.ko] undefined!
>>> ERROR: modpost: "__bswapsi2" [drivers/video/fbdev/core/cfbimgblt.ko] undefined!
>>> ERROR: modpost: "__bswapsi2" [drivers/video/fbdev/core/sysfillrect.ko] undefined!
> WARNING: modpost: suppressed 92 unresolved symbol warnings because there were too many)
>
> Kconfig warnings: (for reference only)
>    WARNING: unmet direct dependencies detected for CAN_DEV
>    Depends on [n]: NETDEVICES [=n] && CAN [=y]
>    Selected by [y]:
>    - CAN [=y] && NET [=y]

Sorry my bad.
While ARC770 cpus do support swape, it seems gcc doesn't define the builtin for
arc700 (and generates a libcall) and as Arnd mentioned we don't have -mcpu=arc770.
As a quick fix/hack we could add EXPORT_SYMBOL this in arch/arc/kernel/arcksyms.c ?

Thx,
-Vineet

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Re: [thomas-weissschuh:b4/at-vector-size-arch 2/24] ERROR: modpost: "__bswapsi2" [fs/ecryptfs/ecryptfs.ko] undefined!

[Arnd Bergmann]

On Tue, Jan 13, 2026, at 07:13, Vineet Gupta wrote:
> On 1/12/26 19:20, kernel test robot wrote:
> Sorry my bad.
> While ARC770 cpus do support swape, it seems gcc doesn't define the 
> builtin for
> arc700 (and generates a libcall) and as Arnd mentioned we don't have 
> -mcpu=arc770.
> As a quick fix/hack we could add EXPORT_SYMBOL this in 
> arch/arc/kernel/arcksyms.c ?

I don't think that exists in the kernel, it's only in libgcc.

How about keeping the inline function, but making it unconditional?

     Arnd

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