Commit 205cbc71 authored by Pu Lehui's avatar Pu Lehui Committed by Paul Walmsley
Browse files

riscv: Enable ARCH_HAVE_NMI_SAFE_CMPXCHG 



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: default avatarPu Lehui <pulehui@huawei.com>
Reviewed-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: default avatarAlexandre 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: default avatarPaul Walmsley <pjw@kernel.org>
parent 6dab7e15

arch/riscv/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ config RISCV 
	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST

	select ARCH_HAS_UBSAN

	select ARCH_HAS_VDSO_ARCH_DATA if GENERIC_VDSO_DATA_STORE

	select ARCH_HAVE_NMI_SAFE_CMPXCHG

	select ARCH_KEEP_MEMBLOCK if ACPI

	select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE	if 64BIT && MMU

	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX