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01abdfeac8
linux/arch/riscv
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Guo Ren 01abdfeac8
riscv: compat: Support TASK_SIZE for compat mode 
Make TASK_SIZE from const to dynamic detect TIF_32BIT flag
function. Refer to arm64 to implement DEFAULT_MAP_WINDOW_64 for
efi-stub.

Limit 32-bit compatible process in 0-2GB virtual address range
(which is enough for real scenarios), because it could avoid
address sign extend problem when 32-bit enter 64-bit and ease
software design.

The standard 32-bit TASK_SIZE is 0x9dc00000:FIXADDR_START, and
compared to a compatible 32-bit, it increases 476MB for the
application's virtual address.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220405071314.3225832-11-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2022-04-26 13:36:18 -07:00
..
boot RISC-V Patches for the 5.18 Merge Window, Part 2 2022-04-01 13:31:57 -07:00
configs RISC-V: K210 defconfigs: Drop redundant MEMBARRIER=n 2022-03-31 17:19:27 -07:00
errata riscv: errata: alternative: mark vendor_patch_func __initdata 2022-01-09 11:02:46 -08:00
include riscv: compat: Support TASK_SIZE for compat mode 2022-04-26 13:36:18 -07:00
kernel RISC-V Patches for the 5.18 Merge Window, Part 2 2022-04-01 13:31:57 -07:00
kvm RISC-V: KVM: Implement SBI HSM suspend call 2022-03-11 19:02:39 +05:30
lib riscv: Fixed misaligned memory access. Fixed pointer comparison. 2022-03-10 10:24:04 -08:00
mm RISC-V Patches for the 5.18 Merge Window, Part 1 2022-03-25 10:11:38 -07:00
net riscv: bpf: Fix eBPF's exception tables 2022-01-19 10:50:02 -08:00
Kbuild kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
Kconfig RISC-V CPU Idle Support 2022-03-30 16:17:54 -07:00
Kconfig.debug RISC-V: Remove EARLY_PRINTK support 2018-12-17 10:23:46 -08:00
Kconfig.erratas riscv: alternative only works on !XIP_KERNEL 2022-03-10 10:05:19 -08:00
Kconfig.socs RISC-V CPU Idle Support 2022-03-30 16:17:54 -07:00
Makefile riscv: Fixup difference with defconfig 2022-04-26 13:36:07 -07:00