linux-kernel - [RFC 10/10] arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on CONFIG_ARM64_[4K|16K]

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Message-Id: <1626229291-6569-11-git-send-email-anshuman.khandual@arm.com>
Date:   Wed, 14 Jul 2021 07:51:31 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, 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 10/10] 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 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 658a6fd..bc7e5c6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -952,9 +952,9 @@ config ARM64_PA_BITS_48
 
 config ARM64_PA_BITS_52
 	bool "52-bit (ARMv8.2)"
-	depends on ARM64_64K_PAGES
 	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.
-- 
2.7.4