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The USE_SPI_DMA macro name suggests that it could be set to 1 to control whether or not SPI DMA should be used. However, that's not what it does. If set to 1, it'll set the SPI messages' "is_dma_mapped" flag to true, even though the tx/rx buffers aren't actually DMA mapped by the driver. In other words, setting this flag to 1 will break the driver. Best to clean up this confusion by removing the macro altogether. There is no need to explicitly initialize "is_dma_mapped" because the message is cleared to zero anyhow, so "is_dma_mapped" is set to false by default. Signed-off-by: David Mosberger-Tang <davidm@egauge.net> Acked-by: Ajay Singh <ajay.kathat@microchip.com> Signed-off-by: Kalle Valo <kvalo@kernel.org> Link: https://lore.kernel.org/r/20211207002453.3193737-1-davidm@egauge.net
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.