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77d707a310
linux/arch/riscv
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Palmer Dabbelt 77d707a310
RISC-V: Only default to spinwait on SBI-0.1 and M-mode 
The spinwait boot method has been superseded by the SBI HSM extension
for some time now, but it still enabled by default.  This causes some
issues on large hart count systems, which will hang if a physical hart
exists that is larger than NR_CPUS.

Users on modern SBI implementation don't need spinwait, and while it's
probably possible to deal with some of the spinwait issues let's just
restrict the default to systems that are likely to actually use it.

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20220421170354.10555-1-palmer@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2022-06-01 18:59:26 -07:00
..
boot riscv: dts: icicle: sort nodes alphabetically 2022-06-01 15:28:51 -07:00
configs RISC-V: configs: Configs that had RPMSG_CHAR now get RPMSG_CTRL 2022-04-26 08:19:53 -07:00
errata riscv: add memory-type errata for T-Head 2022-05-11 21:36:33 -07:00
include RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
kernel RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
kvm RISC-V: KVM: Introduce ISA extension register 2022-05-20 09:09:20 +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 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
net riscv, bpf: Implement more atomic operations for RV64 2022-04-11 16:54:54 +02:00
purgatory RISC-V: Add purgatory 2022-05-19 12:18:59 -07:00
Kbuild RISC-V: Add purgatory 2022-05-19 12:18:59 -07:00
Kconfig RISC-V: Only default to spinwait on SBI-0.1 and M-mode 2022-06-01 18:59:26 -07:00
Kconfig.debug RISC-V: Remove EARLY_PRINTK support 2018-12-17 10:23:46 -08:00
Kconfig.erratas riscv: add memory-type errata for T-Head 2022-05-11 21:36:33 -07:00
Kconfig.socs RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
Makefile RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00