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| author | Heiko Stuebner <heiko@sntech.de> | 2022-05-11 22:29:10 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-05-12 07:36:31 +0300 |
| commit | e64f737ad70fee4a3c57d147fc511e5d5014b5dd (patch) | |
| tree | a7b6a69b39c3238d195371cd24dcbee291db1421 /arch/riscv/Kconfig | |
| parent | 3123109284176b1532874591f7c81f3837bbdc17 (diff) | |
| download | linux-e64f737ad70fee4a3c57d147fc511e5d5014b5dd.tar.xz | |
riscv: integrate alternatives better into the main architecture
Right now the alternatives need to be explicitly enabled and
erratas are limited to SiFive ones.
We want to use alternatives not only for patching soc erratas,
but in the future also for handling different behaviour depending
on the existence of future extensions.
So move the core alternatives over to the kernel subdirectory
and move the CONFIG_RISCV_ALTERNATIVE to be a hidden symbol
which we expect relevant erratas and extensions to just select
if needed.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Link: https://lore.kernel.org/r/20220511192921.2223629-2-heiko@sntech.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 00fd9c548f26..26464dae8ab7 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -324,6 +324,15 @@ config NODES_SHIFT Specify the maximum number of NUMA Nodes available on the target system. Increases memory reserved to accommodate various tables. +config RISCV_ALTERNATIVE + bool + depends on !XIP_KERNEL + help + This Kconfig allows the kernel to automatically patch the + errata required by the execution platform at run time. The + code patching is performed once in the boot stages. It means + that the overhead from this mechanism is just taken once. + config RISCV_ISA_C bool "Emit compressed instructions when building Linux" default y |