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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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.