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Memory regions marked as NOMAP should not be used for general allocation by the kernel, and should not even be covered by the linear mapping (hence the name). However, drivers or other subsystems (such as ACPI) that access the firmware directly may legally access them, which means it is also reasonable for such drivers to claim them by invoking request_resource(). Currently, this is prevented by the fact that arm64's request_standard_resources() marks reserved regions as IORESOURCE_BUSY. So drop the IORESOURCE_BUSY flag from these requests. Reported-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.