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authorYalin Wang <Yalin.Wang@sonymobile.com>2014-11-03 05:01:03 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-12-22 19:43:06 +0300
commit556d2f055bf6d79ce81587dfe774d4dd10da473f (patch)
tree3b1eaeda540d1592936691f953607a377668f90f /lib/Kconfig
parent97bf6af1f928216fd6c5a66e8a57bfa95a659672 (diff)
downloadlinux-556d2f055bf6d79ce81587dfe774d4dd10da473f.tar.xz
ARM: 8187/1: add CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction
this change add CONFIG_HAVE_ARCH_BITREVERSE config option, so that we can use some architecture's bitrev hardware instruction to do bitrev operation. Introduce __constant_bitrev* macro for constant bitrev operation. Change __bitrev16() __bitrev32() to be inline function, don't need export symbol for these tiny functions. Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'lib/Kconfig')
-rw-r--r--lib/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 54cf309a92a5..cd177caf3876 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -13,6 +13,15 @@ config RAID6_PQ
config BITREVERSE
tristate
+config HAVE_ARCH_BITREVERSE
+ boolean
+ default n
+ depends on BITREVERSE
+ help
+ This option provides an config for the architecture which have instruction
+ can do bitreverse operation, we use the hardware instruction if the architecture
+ have this capability.
+
config RATIONAL
boolean