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...to guarantee forward progress. When zapped, root pages are marked invalid and moved to the head of the active pages list until they are explicitly freed. Theoretically, having unzappable root pages at the head of the list could prevent kvm_mmu_zap_all() from making forward progress were a future patch to add a loop restart after processing a page, e.g. to drop mmu_lock on contention. Although kvm_mmu_prepare_zap_page() can theoretically take action on invalid pages, e.g. to zap unsync children, functionally it's not necessary (root pages will be re-zapped when freed) and practically speaking the odds of e.g. @unsync or @unsync_children becoming %true while zapping all pages is basically nil. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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.