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: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index e751fe2..f4989fb 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -137,6 +137,7 @@
select HAVE_DMA_API_DEBUG
select HAVE_DYNAMIC_FTRACE
select HAVE_DYNAMIC_FTRACE_WITH_REGS
+ select HAVE_EFFICIENT_UNALIGNED_ACCESS
select HAVE_EXIT_THREAD
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_GRAPH_TRACER