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94a7734d09
Svade and Svadu extensions represent two schemes for managing the PTE A/D bits. When the PTE A/D bits need to be set, Svade extension intdicates that a related page fault will be raised. In contrast, the Svadu extension supports hardware updating of PTE A/D bits. Since the Svade extension is mandatory and the Svadu extension is optional in RVA23 profile, by default the M-mode firmware will enable the Svadu extension in the menvcfg CSR when only Svadu is present in DT. This patch detects Svade and Svadu extensions from DT and adds arch_has_hw_pte_young() to enable optimization in MGLRU and __wp_page_copy_user() when we have the PTE A/D bits hardware updating support. Co-developed-by: Jinyu Tang <tjytimi@163.com> Signed-off-by: Jinyu Tang <tjytimi@163.com> Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Acked-by: Palmer Dabbelt <palmer@rivosinc.com> Link: https://lore.kernel.org/r/20240726084931.28924-2-yongxuan.wang@sifive.com Signed-off-by: Anup Patel <anup@brainfault.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.