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Subject[RFC 2/3] arm: enable 64BIT_ATOMIC(_ALIGNED)_ACCESS on LPAE enabled machines
Date
 'ldrd/strd' (load/store doublewords) instructions are 64bit atomic as
long as the address is 64-bit aligned on LPAE (Large Physical Address
Extension) enabled architectures. This feature is to guarantee atomic
accesses on newly introduced 64bit wide descriptors in the translation
tables.

Making 64BIT_ATOMIC_ACCESS true, some kernel codes to access 64bit
variables can be optimized by omitting seqlock or the mimic of it.
Also make 64BIT_ATOMIC_ALIGNED_ACCESS true, the 64bit atomic access is
guarnteed only when the address is 64bit algined.

Signed-off-by: Hoeun Ryu <hoeun.ryu@gmail.com>
---
arch/arm/mm/Kconfig | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 60cdfdc..3142572 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -660,6 +660,8 @@ config ARM_LPAE
bool "Support for the Large Physical Address Extension"
depends on MMU && CPU_32v7 && !CPU_32v6 && !CPU_32v5 && \
!CPU_32v4 && !CPU_32v3
+ select 64BIT_ATOMIC_ACCESS
+ select 64BIT_ATOMIC_ALIGNED_ACCESS
help
Say Y if you have an ARMv7 processor supporting the LPAE page
table format and you would like to access memory beyond the
--
2.7.4
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