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authorWill Deacon <will.deacon@arm.com>2010-01-20 19:05:07 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-02-15 21:39:50 +0000
commit24b44a66fa240f6fc63343623ca730d39754047e (patch)
treec271eea37b9559a06b11eb87743856be9a254663 /arch/arm/Kconfig
parenta9221de66d2d94e6e34c3f56bbdd744935020737 (diff)
downloadlinux-2.6.34-ux500-24b44a66fa240f6fc63343623ca730d39754047e.tar.gz
ARM: 5889/1: Add atomic64 routines for ARMv6k and above.
In preparation for perf-events support, ARM needs to support atomic64_t operations. v6k and above support the ldrexd and strexd instructions to do just that. This patch adds atomic64 support to the ARM architecture. v6k and above make use of new instructions whilst older cores fall back on the generic solution using spinlocks. If and when v7-M cores are supported by Linux, they will need to fall back on the spinlock implementation too. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig')
-rw-r--r--arch/arm/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b224216c11d..762ae536f90 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -12,6 +12,7 @@ config ARM
select HAVE_IDE
select RTC_LIB
select SYS_SUPPORTS_APM_EMULATION
+ select GENERIC_ATOMIC64 if (!CPU_32v6K)
select HAVE_OPROFILE
select HAVE_ARCH_KGDB
select HAVE_KPROBES if (!XIP_KERNEL)