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authorChristian Borntraeger <borntraeger@de.ibm.com>2016-09-12 13:13:38 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-09-20 14:26:01 +0200
commit9078a54996a0989e25a04bbb9276bc340a52a673 (patch)
treea3501e4b20c6b146900a906bdd4344dfffc534b0
parentc783b91ebdbab67e848889c29dd0611c2b2c9fea (diff)
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>
-rw-r--r--arch/s390/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index e751fe25d6ab..f4989fb4ac8d 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -137,6 +137,7 @@ config S390
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