9e28bf8bdf
Coldfire cores configured without a data cache are DMA coherent and should thus simply use the simple coherent version of dma-direct. Introduce a new COLDFIRE_COHERENT_DMA Kconfig symbol as a convenient short hand for such configurations, and a M68K_NONCOHERENT_DMA symbol for all cases where we need to build non-coherent DMA infrastructure to simplify the Kconfig and code conditionals. Not building the non-coherent DMA code slightly reduces the code size for such configurations. Numers for m5249evb_defconfig below: text data bss dec hex filename 2896158 401052 65392 3362602 334f2a vmlinux.before 2895166 400988 65392 3361546 334b0a vmlinux.after Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Greg Ungerer <gerg@linux-m68k.org> Acked-by: Geert Uytterhoeven <geert@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.