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ce5ad03e45
Now there 5 places which calculate max_pfn & max_low_pfn: 1. in fdt_setup() for FDT systems; 2. in memblock_init() for ACPI systems; 3. in init_numa_memory() for NUMA systems; 4. in arch_mem_init() to recalculate for "mem=" cmdline; 5. in paging_init() to recalculate for NUMA systems. Since memblock_init() is called both for ACPI and FDT systems, move the calculation out of the for_each_efi_memory_desc() loop can eliminate the first case. The last case is very questionable (may be derived from the MIPS/Loongson code) and breaks the "mem=" cmdline, so should be removed. And then the NUMA version of paging_init() can be also eliminated. After consolidation there are 3 places of calculation: 1. in memblock_init() for both ACPI and FDT systems; 2. in init_numa_memory() to recalculate for NUMA systems; 3. in arch_mem_init() to recalculate for the "mem=" cmdline. For all cases the calculation is: max_pfn = PFN_DOWN(memblock_end_of_DRAM()); max_low_pfn = min(PFN_DOWN(HIGHMEM_START), max_pfn); Cc: stable@vger.kernel.org Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> |
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| 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 | ||
| .pylintrc | ||
| .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.