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As discussion in ALSA https://patchwork.kernel.org/patch/11336023/, it is suggested to skip DMA buffer pre-allocation with passing size=0 when calling snd_pcm_set_managed_buffer(), to make the full buffer_bytes range configured in topology file selectable from user space, here do the corresponding change in SOF PCM driver to implement it. This change doesn't have dependency to the change that Takashi will do in the ALSA core by adding total_pcm_alloc_bytes limitation to the struct snd_card, it passes tests both with or without Takashi's coming change on SOF CML platform. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Keyon Jie <yang.jie@linux.intel.com> Link: https://lore.kernel.org/r/20200228231850.9226-2-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.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.