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Commit 9078a549 authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Martin Schwidefsky
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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: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent c783b91e

arch/s390/Kconfig

+1 −0
Original line number Original line Diff line number Diff line
@@ -137,6 +137,7 @@ config S390 
	select HAVE_DMA_API_DEBUG

	select HAVE_DMA_API_DEBUG

	select HAVE_DYNAMIC_FTRACE

	select HAVE_DYNAMIC_FTRACE

	select HAVE_DYNAMIC_FTRACE_WITH_REGS

	select HAVE_DYNAMIC_FTRACE_WITH_REGS

	select HAVE_EFFICIENT_UNALIGNED_ACCESS

	select HAVE_EXIT_THREAD

	select HAVE_EXIT_THREAD

	select HAVE_FTRACE_MCOUNT_RECORD

	select HAVE_FTRACE_MCOUNT_RECORD

	select HAVE_FUNCTION_GRAPH_TRACER

	select HAVE_FUNCTION_GRAPH_TRACER