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In some iommu, e.g. swiotlb, the available space can be quite limited. So we employ a trial-and-error approach to seeing if our large contiguous chunks can fit, and if that fails we try again with smaller chunks after trying to free our own lazily allocated blobs. As we use a trial-and-error approach, we do not want dma_map_sg() to emit a WARN of its own accord, we want to gracefully report the error back to the caller instead. Note that our noisy culprit, swiotlb, doesn't honour the flag, yet. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180104163842.11635-1-chris@chris-wilson.co.uk
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.