diff options
| author | Pu Lehui <pulehui@huawei.com> | 2025-07-11 12:04:43 +0300 |
|---|---|---|
| committer | Paul Walmsley <pjw@kernel.org> | 2025-09-18 17:20:59 +0300 |
| commit | 205cbc714842478df4239b5be205b9b459fd9fbc (patch) | |
| tree | 020e74a5f4a45793f0d38c266a7d64dc1849444d /arch | |
| parent | 6dab7e15c0b312be79ccadf85c9ec7332427ba7b (diff) | |
| download | linux-205cbc714842478df4239b5be205b9b459fd9fbc.tar.xz | |
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: 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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 51dcd8eaa243..715e59f1e287 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -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 |