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Code regions within cmpxchg_user_key() functions may be executed with a non-default access key, which may lead to a protection exception if the corresponding page has the fetch-protection bit enabled. There is code in place which initializes the storage keys of such pages when needed. However there is also the possibility of out-of-line execution of such code in case a kprobe is set within such a region. To avoid this problem prevent that any kprobe can be set within the cmpxchg_user_key() functions. Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>