diff options
| author | Will Deacon <will.deacon@arm.com> | 2014-03-14 17:47:05 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-05-21 18:58:47 +0100 |
| commit | af6b38abb48ee39ae743dcbd0c3425af0bbaa2ee (patch) | |
| tree | ce09c4e121656981316dd1fea07da1253f3ae089 | |
| parent | 83a6783cbe03e736f3c66e1d1de2a0d360e82821 (diff) | |
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>
(cherry picked from commit c209f79940ac0c75ae8d2f503a2b9d86255e266c)
Signed-off-by: Mark Brown <broonie@linaro.org>
| -rw-r--r-- | arch/arm64/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm64/include/asm/Kbuild | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index d5b813ed86a1..8efcec96de72 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -69,7 +69,7 @@ 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 ae0612c4fa45..53c4a2946444 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 |