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authorWill Deacon <will.deacon@arm.com>2014-03-14 17:47:05 (GMT)
committerChanho Park <chanho61.park@samsung.com>2014-04-16 12:36:50 (GMT)
commitfe0417b98e4ce3787c77e99dea1f2d2a3a28844c (patch)
treea840febac006d2b21abd5c93c303a44121d7e233
parent3a4836689482aa1ab58727470edb486fa18e61c4 (diff)
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arm64: rwsem: use asm-generic rwsem implementation
asm-generic offers an atomic-add based rwsem implementation, which can avoid the need for heavier, spinlock-based synchronisation on the fast path. This patch makes use of the optimised implementation for arm64 CPUs. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
-rw-r--r--arch/arm64/Kconfig2
-rw-r--r--arch/arm64/include/asm/Kbuild1
2 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f542be0..7231ef9 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -78,7 +78,7 @@ config LOCKDEP_SUPPORT
config TRACE_IRQFLAGS_SUPPORT
def_bool y
-config RWSEM_GENERIC_SPINLOCK
+config RWSEM_XCHGADD_ALGORITHM
def_bool y
config GENERIC_HWEIGHT
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index ae0612c..53c4a29 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -29,6 +29,7 @@ generic-y += pci.h
generic-y += poll.h
generic-y += posix_types.h
generic-y += resource.h
+generic-y += rwsem.h
generic-y += scatterlist.h
generic-y += sections.h
generic-y += segment.h