[PATCH 02/12] RISC-V: MAXPHYSMEM_2GB doesn't depend on CMODEL_MEDLOW

From: Palmer Dabbelt
Date: Fri Nov 19 2021 - 11:44:50 EST

From: Palmer Dabbelt <palmer@xxxxxxxxxxxx>

For non-relocatable kernels we need to be able to link the kernel at
approximately PAGE_OFFSET, thus requiring medany (as medlow requires the
code to be linked within 2GiB of 0). The inverse doesn't apply, though:
since medany code can be linked anywhere it's fine to link it close to
0, so we can support the smaller memory config.

Fixes: de5f4b8f634b ("RISC-V: Define MAXPHYSMEM_1GB only for RV32")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>


I found this when going through the savedefconfig diffs for the K210
defconfigs. I'm not entirely sure they're doing the right thing here
(they should probably be setting CMODEL_LOW to take advantage of the
better code generation), but I don't have any way to test those
platforms so I don't want to change too much.
arch/riscv/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 821252b65f89..61f64512dcde 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -280,7 +280,7 @@ choice
depends on 32BIT
bool "1GiB"
- depends on 64BIT && CMODEL_MEDLOW
+ depends on 64BIT
bool "2GiB"
depends on 64BIT && CMODEL_MEDANY