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

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Message-Id: <1632998116-11552-13-git-send-email-anshuman.khandual@arm.com>
Date:   Thu, 30 Sep 2021 16:05:15 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     suzuki.poulose@....com, mark.rutland@....com, will@...nel.org,
        catalin.marinas@....com, maz@...nel.org, james.morse@....com,
        steven.price@....com, Anshuman Khandual <anshuman.khandual@....com>
Subject: [RFC V3 12/13] arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on CONFIG_ARM64_[4K|16K]_PAGES

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@....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