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ac9245a540
A few drivers want to have rather the exact buffer preallocation at the driver probe time and keep using it for the whole operations without allowing dynamic buffer allocation. For satisfying the demands, this patch extends the managed buffer allocation API slightly. Namely, when 0 is passed to max argument of the allocation helper functions snd_pcm_set_managed_buffer*(), it treats as if the fixed size allocation of the given size. If the pre-allocation fails in this mode, the function returns now -ENOMEM. Otherwise, i.e. max argument is non-zero, the function never returns -ENOMEM but tries to fall back to the smaller chunks and allows the dynamic allocation later -- which is still the default behavior until now. For more intuitive use, also two new helpers are added for handling the fixed size buffer allocation, too: snd_pcm_set_fixed_buffer() and snd_pcm_set_fixed_buffer_all(). Acked-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20210802072815.13551-4-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.