mirror of
https://github.com/torvalds/linux.git
synced 2026-07-29 02:31:27 +02:00
Linux kernel source tree
221bf5cac5
A number of mremap() calls both pass around and modify a large number of parameters, making the code less readable and often repeatedly having to determine things such as VMA, size delta, and more. Avoid this by using the common pattern of passing a state object through the operation, updating it as we go. We introduce the vma_remap_struct or 'VRM' for this purpose. This also gives us the ability to accumulate further state through the operation that would otherwise require awkward and error-prone pointer passing. We can also now trivially define helper functions that operate on a VRM object. This pattern has proven itself to be very powerful when implemented for VMA merge, VMA unmapping and memory mapping operations, so it is battle-tested and functional. We both introduce the data structure and use it, introducing helper functions as needed to make things readable, we move some state such as mmap lock and mlock() status to the VRM, we introduce a means of classifying the type of mremap() operation and de-duplicate the get_unmapped_area() lookup. We also neatly thread userfaultfd state throughout the operation. Note that there is further refactoring to be done, chiefly adjust move_vma() to accept a VRM parameter. We defer this as there is pre-requisite work required to be able to do so which we will do in a subsequent patch. Link: https://lkml.kernel.org/r/27951739dc83b2b1523b81fa9c009ba348388d40.1741639347.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Harry Yoo <harry.yoo@oracle.com> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.