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s390: add support for DCACHE_WORD_ACCESS
Implement load_unaligned_zeropad() and enable DCACHE_WORD_ACCESS to speed up string operations in fs/dcache.c and fs/namei.c. Reviewed-by: Sven Schnelle <svens@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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