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On buffer change, the driver informs the mite module about the buffer change and then it fills the buffer with byte value `0xaa` using `memset()`. Do not bother filling the buffer. None of the other Comedi drivers do this. The aim is to get rid of the `prealloc_buf` member of `struct comedi_async` (which is from a `vmap()` covering the whole buffer in those Comedi drivers that do not use DMA), and use the per-buffer-page addresses from the `virt_addr` member of `struct comedi_buf_page` to access the buffer contents instead. (If necessary, we could add a `comedi_buf_memset()` function to fill the buffer with a byte value, but it's not worth it in this case.) Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20250415114008.5977-2-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 reStructuredText 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.