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With a specifically contrived memory layout where there is no physical memory available to the kernel below the 4GB boundary, we will fail to perform the initial swiotlb_init() call and set no_iotlb_memory to true. There are drivers out there that call into swiotlb_nr_tbl() to determine whether they can use the SWIOTLB. With the right DMA_BIT_MASK() value for these drivers (say 64-bit), they won't ever need to hit swiotlb_tbl_map_single() so this can go unoticed and we would be possibly lying about those drivers. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.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.