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[RFC,2/3] arm: enable 64BIT_ATOMIC(_ALIGNED)_ACCESS on LPAE enabled machines

Message ID 1503553377-3646-3-git-send-email-hoeun.ryu@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Hoeun Ryu Aug. 24, 2017, 5:42 a.m. UTC 
'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(+)
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Patch

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