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d955dab33a
We avoided the explicit use of dma_mmap_coherent() on x86 because of a spurious warning in x86 APT code in the past. However, this blindly assumes that the pages allocated via dma_alloc_coherent() on x86 are the ones convertible via virt_to_page() (that is used in the default mmap handler), and it's no longer true; with the indirect DMA ops, this can be handled differently. The only certain way for doing mmap such pages is the dma_mmap_coherent(), and the warning seems already gone in the recent code, so let's use it consistently. Link: https://lore.kernel.org/r/20200615160045.2703-2-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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.