s390: claim efficient unaligned access
most unaligned accesses are reasonable efficient (no kernel emulation) on s390, let's announce it This also - removes the ubsan false positives for unaligned accesses on s390 with default config - uses simpler arithmetic in several functions in several other areas of the kernel like ethernet frame classification Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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