39503fc84b
The EFI memory map at 'boot_memmap' is crucial for kdump to understand the primary kernel's memory layout. This memory region, typically part of EFI Boot Services (BS) data, can be overwritten after ExitBootServices if not explicitly preserved by the kernel. This commit addresses this by: 1. Calling memblock_reserve() to reserve the entire physical region occupied by the EFI memory map (header + descriptors). This prevents the primary kernel from reallocating and corrupting this area. 2. Setting the EFI_PRESERVE_BS_REGIONS flag in efi.flags. This indicates that efforts have been made to preserve critical BS code/data regions which can be useful for other kernel subsystems or debugging. These changes ensure the original EFI memory map data remains intact, improving kdump reliability and potentially aiding other EFI-related functionalities that might rely on preserved BS code/data. Signed-off-by: Ming Wang <wangming01@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> |
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| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.