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ae482ec8cdConcurrent VM bind staging and zapping of PTEs from a userptr notifier do not work because the view of PTEs is not stable. VM binds cannot acquire the notifier lock during staging, as memory allocations are required. To resolve this race condition, use a staging tree for VM binds that is committed only under the userptr notifier lock during the final step of the bind. This ensures a consistent view of the PTEs in the userptr notifier. A follow up may only use staging for VM in fault mode as this is the only mode in which the above race exists. v3: - Drop zap PTE change (Thomas) - s/xe_pt_entry/xe_pt_entry_staging (Thomas) Suggested-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Cc: <stable@vger.kernel.org> Fixes: |
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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.