[RFC V3 12/13] arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on CONFIG_ARM64_[4K|16K]_PAGES

From: Anshuman Khandual
Date: Thu Sep 30 2021 - 06:35:12 EST


All required FEAT_LPA2 components for 52 bit PA range are already in place.
Just enable CONFIG_ARM64_PA_BITS_52 on 4K and 16K pages which would select
CONFIG_ARM64_PA_BITS_52_LPA2 activating 52 bit PA range via FEAT_LPA2.

Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
arch/arm64/Kconfig | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f58ef62..926a802 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -948,17 +948,17 @@ config ARM64_PA_BITS_48
bool "48-bit"

config ARM64_PA_BITS_52
- bool "52-bit (ARMv8.2)"
- depends on ARM64_64K_PAGES
+ bool "52-bit"
depends on ARM64_PAN || !ARM64_SW_TTBR0_PAN
select ARM64_PA_BITS_52_LPA if ARM64_64K_PAGES
+ select ARM64_PA_BITS_52_LPA2 if (ARM64_4K_PAGES || ARM64_16K_PAGES)
help
Enable support for a 52-bit physical address space, introduced as
- part of the ARMv8.2-LPA extension.
+ part of the ARMv8.2-LPA or ARMv8.7-LPA2 extension.

With this enabled, the kernel will also continue to work on CPUs that
- do not support ARMv8.2-LPA, but with some added memory overhead (and
- minor performance overhead).
+ do not support ARMv8.2-LPA or ARMv8.7-LPA2, but with some added memory
+ overhead (and minor performance overhead).

endchoice

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2.7.4