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arm64: rwsem: use asm-generic rwsem implementation

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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>
This commit is contained in:
Will Deacon 2014-03-14 17:47:05 +00:00 committed by Catalin Marinas
parent e172800e5d
commit c209f79940
2 changed files with 2 additions and 1 deletions
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2
arch/arm64/Kconfig
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@ -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

1
arch/arm64/include/asm/Kbuild
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@ -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