ERROR: modpost: lib/kunit/kunit-example-test.ko: symbol '__mulsi3' undefined!

[kernel test robot]

Hi Karl,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   c339f4010dea8b0d754f84ace70cd1b089878ef8
commit: 7c3f4d699f34535285d0ceb184927d71543d0064 resource, kunit: stop selecting GET_FREE_REGION
date:   2 weeks ago
config: openrisc-randconfig-r2306-20261028 (https://download.01.org/0day-ci/archive/20261029/202610290106.o8Fs3NvO-lkp@xxxxxxxxx/config)
compiler: or1k-linux-gcc (GCC) 16.2.0
sparse: v0.6.5-rc1-1-gc4640450
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261029/202610290106.o8Fs3NvO-lkp@xxxxxxxxx/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
| Fixes: 7c3f4d699f34 ("resource, kunit: stop selecting GET_FREE_REGION")
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610290106.o8Fs3NvO-lkp@xxxxxxxxx/

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

ERROR: modpost: kernel/rcu/rcutorture.ko: symbol '__mulsi3' undefined!
ERROR: modpost: fs/fuse/virtiofs.ko: symbol '__mulsi3' undefined!
ERROR: modpost: fs/pstore/ramoops.ko: symbol '__mulsi3' undefined!
ERROR: modpost: fs/ecryptfs/ecryptfs.ko: symbol '__mulsi3' undefined!
ERROR: modpost: fs/overlayfs/overlay.ko: symbol '__mulsi3' undefined!
ERROR: modpost: crypto/asymmetric_keys/pkcs8_key_parser.ko: symbol '__mulsi3' undefined!
ERROR: modpost: crypto/ccm.ko: symbol '__mulsi3' undefined!
ERROR: modpost: lib/kunit/kunit.ko: symbol '__mulsi3' undefined!
ERROR: modpost: lib/kunit/kunit-test.ko: symbol '__mulsi3' undefined!
>> ERROR: modpost: lib/kunit/kunit-example-test.ko: symbol '__mulsi3' undefined!
WARNING: modpost: suppressed 1014 unresolved symbol warnings because there were too many)

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