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__cmpxchg_user_key() uses 128 bit types which, depending on compiler
and config options, may lead to an __ashlti3() library call.
Get rid of that by simply casting the 128 bit values to 32 bit values.
Reported-by: kernel test robot <lkp@intel.com>
Suggested-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Fixes: 51098f0eb2 ("s390/cmpxchg: make loop condition for 1,2 byte cases precise")
Link: https://lore.kernel.org/all/4b96b112d5415d08a81d30657feec2c8c3000f7c.camel@linux.ibm.com/
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>