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2e5920bb07
According to the current crashkernel=Y,low support in other ARCHes, it's an optional command-line option. When it doesn't exist, kernel will try to allocate minimum required memory below 4G automatically. However, __parse_crashkernel() returns '-EINVAL' for all error cases. It can't distinguish the nonexistent option from invalid option. Change __parse_crashkernel() to return '-ENOENT' for the nonexistent option case. With this change, crashkernel,low memory will take the default value if crashkernel=,low is not specified; while crashkernel reservation will fail and bail out if an invalid option is specified. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Acked-by: Baoquan He <bhe@redhat.com> Link: https://lore.kernel.org/r/20220506114402.365-2-thunder.leizhen@huawei.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.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 Restructured Text 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.