ffd32a92b3
Coldfire platforms with data caches can't properly implement dma_alloc_coherent and currently just return noncoherent memory from dma_alloc_coherent. The fec driver than works around this with a flush of all caches in the receive path. Make this hack a little less bad by using the explicit dma_alloc_noncoherent API and documenting the hacky cache flushes so that the DMA API level hack can be removed. Also replace the check for CONFIG_M532x for said hack with a check for COLDFIRE && !COLDFIRE_COHERENT_DMA. While m532x is the only such platform with a fec module, this makes the code more consistent and easier to follow. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Greg Ungerer <gerg@linux-m68k.org> Tested-by: Greg Ungerer <gerg@linux-m68k.org>
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.