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8db6f937f4
linux/arch/riscv
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Geert Uytterhoeven 8db6f937f4
riscv: Only extend kernel reservation if mapped read-only 
When the kernel mapping was moved outside of the linear mapping, the
kernel memory reservation was increased, to take into account mapping
granularity.  However, this is done unconditionally, regardless of
whether the kernel memory is mapped read-only or not.

If this extension is not needed, up to 2 MiB may be lost, which has a
big impact on e.g. Canaan K210 (64-bit nommu) platforms with only 8 MiB
of RAM.

Reclaim the lost memory by only extending the reserved region when
needed, i.e. depending on a simplified version of the conditional logic
around the call to protect_kernel_linear_mapping_text_rodata().

Fixes: 2bfc6cd81b ("riscv: Move kernel mapping outside of linear mapping")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
2021-05-06 09:40:12 -07:00
..
boot RISC-V Patches for the 5.13 Merge Window, Part 1 2021-05-06 09:24:18 -07:00
configs RISC-V: Enable Microchip PolarFire ICICLE SoC 2021-04-26 08:31:32 -07:00
errata riscv: sifive: Apply errata "cip-1200" patch 2021-04-26 08:24:58 -07:00
include RISC-V Patches for the 5.13 Merge Window, Part 1 2021-05-06 09:24:18 -07:00
kernel RISC-V Patches for the 5.13 Merge Window, Part 1 2021-05-06 09:24:18 -07:00
lib riscv: Add support for function error injection 2021-01-14 15:09:09 -08:00
mm riscv: Only extend kernel reservation if mapped read-only 2021-05-06 09:40:12 -07:00
net riscv: bpf: Avoid breaking W^X 2021-04-26 08:25:14 -07:00
Kbuild riscv: Allow device trees to be built into the kernel 2020-05-18 11:38:05 -07:00
Kconfig RISC-V Patches for the 5.13 Merge Window, Part 1 2021-05-06 09:24:18 -07:00
Kconfig.debug RISC-V: Remove EARLY_PRINTK support 2018-12-17 10:23:46 -08:00
Kconfig.erratas riscv: sifive: Apply errata "cip-1200" patch 2021-04-26 08:24:58 -07:00
Kconfig.socs RISC-V Patches for the 5.13 Merge Window, Part 1 2021-05-06 09:24:18 -07:00
Makefile RISC-V: enable XIP 2021-04-26 08:31:28 -07:00