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authorWill Deacon <will.deacon@arm.com>2014-03-14 17:47:05 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2014-03-14 18:02:09 +0000
commitc209f79940ac0c75ae8d2f503a2b9d86255e266c (patch)
tree206ccdfb1d2afcaffc1e662fc6e487cd6a26a597
parente172800e5d3162f97d332b3745e3743ce150ec48 (diff)
downloadlinux-c209f79940ac0c75ae8d2f503a2b9d86255e266c.tar.bz2
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>
-rw-r--r--arch/arm64/Kconfig2
-rw-r--r--arch/arm64/include/asm/Kbuild1
2 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 8cabe36e285c..4723fc14cf2d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -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
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 71c53ecfcc3a..41cde70943fb 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -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