mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-23 03:16:27 -04:00
205cbc7148
The implement of cmpxchg() in riscv is based on atomic primitives and has NMI-safe features, so it can be used safely in the in_nmi context. ftrace's ringbuffer relies on NMI-safe cmpxchg() in the NMI context. Currently, in_nmi() is true when riscv kprobe is in trap-based mode, so this config needs to be selected, otherwise kprobetrace will not be available. Signed-off-by: Pu Lehui <pulehui@huawei.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20250711090443.1688404-1-pulehui@huaweicloud.com [pjw@kernel.org: moved to preserve alphabetical order] Signed-off-by: Paul Walmsley <pjw@kernel.org>