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linux/arch/riscv
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Danil Skrebenkov e5d5b4228e RISC-V: clear hot-unplugged cores from all task mm_cpumasks to avoid rfence errors 
[ Upstream commit ae9e9f3d67 ]

openSBI v1.7 adds harts checks for ipi operations. Especially it
adds comparison between hmask passed as an argument from linux
and mask of online harts (from openSBI side). If they don't
fit each other the error occurs.

When cpu is offline, cpu_online_mask is explicitly cleared in
__cpu_disable. However, there is no explicit clearing of
mm_cpumask. mm_cpumask is used for rfence operations that
call openSBI RFENCE extension which uses ipi to remote harts.
If hart is offline there may be error if mask of linux is not
as mask of online harts in openSBI.

this patch adds explicit clearing of mm_cpumask for offline hart.

Signed-off-by: Danil Skrebenkov <danil.skrebenkov@cloudbear.ru>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20250919132849.31676-1-danil.skrebenkov@cloudbear.ru
[pjw@kernel.org: rewrote subject line for clarity]
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-12-07 06:09:27 +09:00
..
boot riscv: dts: sifive: add missing #interrupt-cells to pmic 2024-03-26 18:21:12 -04:00
configs RISC-V: defconfigs: Set CONFIG_FB=y, for FB console 2022-07-12 16:34:54 +02:00
errata riscv: skip errata_cip_453.o if CONFIG_ERRATA_SIFIVE_CIP_453 is disabled 2021-06-01 21:16:41 -07:00
include sched: Add wrapper for get_wchan() to keep task blocked 2025-08-28 16:24:03 +02:00
kernel RISC-V: clear hot-unplugged cores from all task mm_cpumasks to avoid rfence errors 2025-12-07 06:09:27 +09:00
lib riscv: uaccess: Return the number of bytes effectively not copied 2023-08-26 14:23:36 +02:00
mm riscv: ptdump: use seq_puts() in pt_dump_seq_puts() macro 2025-12-07 06:09:25 +09:00
net riscv, bpf: Sign-extend return values 2023-10-19 23:05:34 +02:00
Kbuild riscv: Allow device trees to be built into the kernel 2020-05-18 11:38:05 -07:00
Kconfig riscv: define ILLEGAL_POINTER_VALUE for 64bit 2024-10-17 15:11:38 +02:00
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 2022-03-16 14:23:42 +01:00
Kconfig.socs riscv: alternative only works on !XIP_KERNEL 2022-03-16 14:23:42 +01:00
Makefile riscv: Handle zicsr/zifencei issues between clang and binutils 2023-03-30 12:47:59 +02:00