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There are following issues in arm64 kdump: 1. We use crashkernel=X to reserve crashkernel in DMA zone, which will fail when there is not enough low memory. 2. If reserving crashkernel above DMA zone, in this case, crash dump kernel will fail to boot because there is no low memory available for allocation. To solve these issues, introduce crashkernel=X,[high,low]. The "crashkernel=X,high" is used to select a region above DMA zone, and the "crashkernel=Y,low" is used to allocate specified size low memory. Signed-off-by: Chen Zhou <chenzhou10@huawei.com> Co-developed-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Link: https://lore.kernel.org/r/20220506114402.365-4-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.