ARM: 8047/1: rwsem: use asm-generic rwsem implementation (8a87411b) · Commits · 戴 / test

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 ARM CPUs. Signed-off-by:

Will Deacon <will.deacon@arm.com> Signed-off-by:

Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Kconfig

+1 −4

Original line number	Diff line number	Diff line
		@@ -165,12 +165,9 @@ config TRACE_IRQFLAGS_SUPPORT
		bool
		default y

		config RWSEM_GENERIC_SPINLOCK
		bool
		default y

		config RWSEM_XCHGADD_ALGORITHM
		bool
		default y

		config ARCH_HAS_ILOG2_U32
		bool

arch/arm/include/asm/Kbuild

+1 −0

Original line number	Diff line number	Diff line
		@@ -21,6 +21,7 @@ generic-y += parport.h
		generic-y += poll.h
		generic-y += preempt.h
		generic-y += resource.h
		generic-y += rwsem.h
		generic-y += sections.h
		generic-y += segment.h
		generic-y += sembuf.h

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