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| author | Will Deacon | 2013-10-09 18:19:22 +0200 |
|---|---|---|
| committer | Russell King | 2013-10-29 12:06:11 +0100 |
| commit | 0cbad9c9dfe0c38e8ec7385b39087c005a6dee3e (patch) | |
| tree | c835625cbf2eb478134713fe1df99ca5e4e9bbf3 /arch/arm/Kconfig | |
| parent | ARM: 7853/1: cmpxchg: implement cmpxchg64_relaxed (diff) | |
| download | kernel-qcow2-linux-0cbad9c9dfe0c38e8ec7385b39087c005a6dee3e.tar.gz kernel-qcow2-linux-0cbad9c9dfe0c38e8ec7385b39087c005a6dee3e.tar.xz kernel-qcow2-linux-0cbad9c9dfe0c38e8ec7385b39087c005a6dee3e.zip | |
ARM: 7854/1: lockref: add support for lockless lockrefs using cmpxchg64
Our spinlocks are only 32-bit (2x16-bit tickets) and, on processors
with 64-bit atomic instructions, cmpxchg64 makes use of the double-word
exclusive accessors.
This patch wires up the cmpxchg-based lockless lockref implementation
for ARM.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 1ad6fb6c094d..fc184bcd7848 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -5,6 +5,7 @@ config ARM select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAVE_CUSTOM_GPIO_H + select ARCH_USE_CMPXCHG_LOCKREF select ARCH_WANT_IPC_PARSE_VERSION select BUILDTIME_EXTABLE_SORT if MMU select CLONE_BACKWARDS |