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e469e2045f
The recent changes in IOMMU made the non-contiguous page allocations as default, hence we can simply use the standard DMA allocation for the S/G pages as well. In this patch, we simplify the code by trying the standard DMA allocation at first, instead of dma_alloc_noncontiguous(). For the case without IOMMU, we still need to manage the S/G pages manually, so we keep the same fallback routines like before. The fallback types (SNDRV_DMA_TYPE_DEV_SG_FALLBACK & co) are dropped / folded into SNDRV_DMA_TYPE_DEV_SG and co now. The allocation via the standard DMA call overrides the type accordingly, hence we don't have to have extra fallback types any longer. OTOH, SNDRV_DMA_TYPE_DEV_SG is no longer an alias but became its own type back again. Note that this patch requires another prerequisite fix for memmalloc helper to use the DMA API for WC pages on x86. Link: https://bugzilla.kernel.org/show_bug.cgi?id=219087 Link: https://patch.msgid.link/20240801064808.31205-2-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 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.