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Andy Chiu <andy.chiu@sifive.com> says: We add a vlenb field in Vector context and save it with the riscv_vstate_save() macro. It should not cause performance regression as VLENB is a design-time constant and is frequently used by hardware. Also, adding this field into the __sc_riscv_v_state may benifit us on a future compatibility issue becuse a hardware may have writable VLENB. Adding and saving VLENB have an immediate benifit as it gives ptrace a better view of the Vector extension and makes it possible to reconstruct Vector register files from the dump without doing an additional csr read. This patchset also sync the number of note types between us and gdb for riscv to solve a conflicting note. This is not an ABI break given that 6.5 has not been released yet. * b4-shazam-merge: RISC-V: vector: export VLENB csr in __sc_riscv_v_state RISC-V: Remove ptrace support for vectors Link: https://lore.kernel.org/r/20230816155450.26200-1-andy.chiu@sifive.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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 Restructured Text 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.