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Commit c209f799 authored Mar 14, 2014 by Will Deacon Committed by Catalin Marinas Mar 14, 2014

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>

parent e172800e

arch/arm64/Kconfig

+1 −1

Original line number	Diff line number	Diff line
		@@ -77,7 +77,7 @@ config LOCKDEP_SUPPORT
		config TRACE_IRQFLAGS_SUPPORT
		def_bool y

		config RWSEM_GENERIC_SPINLOCK
		config RWSEM_XCHGADD_ALGORITHM
		def_bool y

		config GENERIC_HWEIGHT

arch/arm64/include/asm/Kbuild

+1 −0

Original line number	Diff line number	Diff line
		@@ -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