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The drm_mm range manager (within i915_address_space) uses a special drm_mm_node that excludes the unavailable range (beyond the end of the drm_mm). However, we play games with the global GTT to use the head_node to exclude the tail page but tell ourselves that the whole range is available. This causes an issue when we try to evict using the full range of the global GTT which is wider than the drm_mm, resulting in complete confusion and catastrophe. One way to resolve this would be to use a reserved node to exclude the guard page, or we can treat the drm_mm's head_node as our guard page and assign it the appropriate colour. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170206084547.27921-2-chris@chris-wilson.co.uk Reviewed-by: Matthew Auld <matthew.auld@intel.com>
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.