linux-kernel - [PATCH v2 3/8] riscv: Simplify MAXPHYSMEM config

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Date:   Wed,  3 Jun 2020 04:10:59 -0400
From:   Alexandre Ghiti <alex@...ti.fr>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Zong Li <zong.li@...ive.com>, Anup Patel <anup@...infault.org>,
        Christoph Hellwig <hch@....de>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Alexandre Ghiti <alex@...ti.fr>
Subject: [PATCH v2 3/8] riscv: Simplify MAXPHYSMEM config

Either the user specifies maximum physical memory size of 2GB or the
user lives with the system constraint which is 1/4th of maximum
addressable memory in Sv39 MMU mode (i.e. 128GB) for now.

Signed-off-by: Alexandre Ghiti <alex@...ti.fr>
Reviewed-by: Anup Patel <anup@...infault.org>
---
 arch/riscv/Kconfig | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 64b25a90d60f..e167f16131f4 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -106,7 +106,7 @@ config PAGE_OFFSET
 	default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
 	default 0x80000000 if 64BIT && !MMU
 	default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
-	default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
+	default 0xffffffe000000000 if 64BIT && !MAXPHYSMEM_2GB
 
 config ARCH_FLATMEM_ENABLE
 	def_bool y
@@ -223,19 +223,11 @@ config MODULE_SECTIONS
 	bool
 	select HAVE_MOD_ARCH_SPECIFIC
 
-choice
-	prompt "Maximum Physical Memory"
-	default MAXPHYSMEM_2GB if 32BIT
-	default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
-	default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
-
-	config MAXPHYSMEM_2GB
-		bool "2GiB"
-	config MAXPHYSMEM_128GB
-		depends on 64BIT && CMODEL_MEDANY
-		bool "128GiB"
-endchoice
-
+config MAXPHYSMEM_2GB
+	bool "Maximum Physical Memory 2GiB"
+	default y if 32BIT
+	default y if 64BIT && CMODEL_MEDLOW
+	default n
 
 config SMP
 	bool "Symmetric Multi-Processing"
-- 
2.20.1