arm64: rwsem: use asm-generic rwsem implementation
authorWill Deacon <will.deacon@arm.com>
Fri, 14 Mar 2014 17:47:05 +0000 (17:47 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Fri, 14 Mar 2014 18:02:09 +0000 (18:02 +0000)
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>
arch/arm64/Kconfig
arch/arm64/include/asm/Kbuild

index 8cabe36e285cce9b1e30a9261255f2c10df5443f..4723fc14cf2d8acbba5e172519cebbd43bfcc6ac 100644 (file)
@@ -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
index 71c53ecfcc3ae356f0c5d0bd4c593e3b7bef8b89..41cde70943fb0cf31477c1ce17dad5de96837d5c 100644 (file)
@@ -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