[paulmck-rcu:dev.2024.05.18a 44/51] update.c:undefined reference to `cmpxchg_emu_u8'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2024.05.18a
head:   0e3eb8082184e066eb389f5e6f9c7b8c2d452d66
commit: c48887df74a95090e633a29ffbcef00b71cdab66 [44/51] rcu-tasks: Remove open-coded one-byte cmpxchg() emulation
config: um-allyesconfig (https://download.01.org/0day-ci/archive/20240527/202405271352.XYjxKyUi-lkp@xxxxxxxxx/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240527/202405271352.XYjxKyUi-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
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405271352.XYjxKyUi-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   /usr/bin/ld: kernel/rcu/update.o: in function `rcu_trc_cmpxchg_need_qs':
>> update.c:(.text+0x27d5): undefined reference to `cmpxchg_emu_u8'
   /usr/bin/ld: kernel/rcu/update.o: in function `trc_read_check_handler':
   update.c:(.text+0x2839): undefined reference to `cmpxchg_emu_u8'
>> /usr/bin/ld: update.c:(.text+0x2882): undefined reference to `cmpxchg_emu_u8'
   /usr/bin/ld: kernel/rcu/update.o: in function `trc_inspect_reader':
   update.c:(.text+0x52ce): undefined reference to `cmpxchg_emu_u8'
   /usr/bin/ld: update.c:(.text+0x5330): undefined reference to `cmpxchg_emu_u8'
   /usr/bin/ld: kernel/rcu/update.o:update.c:(.text+0x5933): more undefined references to `cmpxchg_emu_u8' follow
>> collect2: error: ld returned 1 exit status

-- 
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