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

Anshuman Khandual anshuman.khandual at arm.com
Thu Sep 30 03:35:15 PDT 2021


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 at arm.com>
---
 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
 
-- 
2.7.4




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