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Ming Wang
1488733022
The LoongArch mem= parameter parser was previously limited to the mem=<size>@<start> format. This was inconvenient for the common use case of simply capping the total system memory, as it forced users to manually specify a start address. It was also inconsistent with the behavior on other architectures. This patch enhances the parser in early_parse_mem() to also support the more user-friendly mem=<size> format. The implementation now checks for the presence of the '@' symbol to determine the user's intent: - If mem=<size> is provided (no '@'), the kernel now calls memblock_enforce_memory_limit(). This trims memory from the top down to the specified size. - If mem=<size>@<start> is provided, the original behavior is retained for backward compatibility. This allows for defining specific memory banks. This change introduces an important usage rule reflected in the code's comments: the mem=<size> format should only be specified once on the kernel command line. It acts as a single, global cap on total memory. In contrast, the mem=<size>@<start> format can be specified multiple times to define several distinct memory regions. Signed-off-by: Ming Wang <wangming01@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>
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.