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66673099f7
The RISC-V port copies the PGD table from init_mm/swapper_pg_dir to all userland page tables, which means that if the PGD level table is changed, other page tables has to be updated as well. Instead of having the PGD changes ripple out to all tables, the synchronization can be avoided by pre-allocating the PGD entries/pages at boot, avoiding the synchronization all together. This is currently done for the bpf/modules, and vmalloc PGD regions. Extend this scheme for the PGD regions touched by memory hotplugging. Prepare the RISC-V port for memory hotplug by pre-allocate vmemmap/direct map/kasan entries at the PGD level. This will roughly waste ~128 (plus 32 if KASAN is enabled) worth of 4K pages when memory hotplugging is enabled in the kernel configuration. Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Signed-off-by: Björn Töpel <bjorn@rivosinc.com> Link: https://lore.kernel.org/r/20240605114100.315918-3-bjorn@kernel.org 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 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.