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>
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 8cabe36..4723fc1 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -77,7 +77,7 @@
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 71c53ec..41cde70 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -29,6 +29,7 @@
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
