s390/kprobes: make insn pages read-only
Make sure that kprobe insn pages are not writable anymore. Tested-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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