[PATCH 5.10 074/199] RISC-V: Fix maximum allowed phsyical memory for RV32

Greg Kroah-Hartman
2021-01-26T09:32:43Z

From: Atish Patra <atish.patra@wdc.com>

[ Upstream commit e557793799c5a8406afb08aa170509619f7eac36 ]

Linux kernel can only map 1GB of address space for RV32 as the page offset
is set to 0xC0000000. The current description in the Kconfig is confusing
as it indicates that RV32 can support 2GB of physical memory. That is
simply not true for current kernel. In future, a 2GB split support can be
added to allow 2GB physical address space.

Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/riscv/Kconfig | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 44377fd7860e4..234a21d26f674 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -134,7 +134,7 @@ config PA_BITS

config PAGE_OFFSET
hex
- default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
+ default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB
default 0x80000000 if 64BIT && !MMU
default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
@@ -247,10 +247,12 @@ config MODULE_SECTIONS

choice
prompt "Maximum Physical Memory"
- default MAXPHYSMEM_2GB if 32BIT
+ default MAXPHYSMEM_1GB if 32BIT
default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY

+ config MAXPHYSMEM_1GB
+ bool "1GiB"
config MAXPHYSMEM_2GB
bool "2GiB"
config MAXPHYSMEM_128GB
--
2.27.0