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s390/kasan: use set_pXe_bit() for pgtable entries setup
Convert setup of pgtable entries to use set_pXe_bit() helpers as the preferred way in MM code. Locally introduce pgprot_clear_bit() helper, which is strictly speaking a generic function. However, it is only x86 pgprot_clear_protnone_bits() helper, which does a similar thing, so do not make it public. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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