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Patch series "mm: perform guard region install/remove under VMA lock", v2. There is no reason why can't perform guard region operations under the VMA lock, as long we take proper precautions to ensure that we do so in a safe manner. This is fine, as VMA lock acquisition is always best-effort, so if we are unable to do so, we can simply fall back to using the mmap read lock. Doing so will reduce mmap lock contention for callers performing guard region operations and help establish a precedent of trying to use the VMA lock where possible. As part of this change we perform a trivial rename of page walk functions which bypass safety checks (i.e. whether or not mm_walk_ops->install_pte is specified) in order that we can keep naming consistent with the mm walk. This is because we need to expose a VMA-specific walk that still allows us to install PTE entries. This patch (of 2): Make it clear we're referencing an unsafe variant of this function explicitly. This is laying the foundation for exposing more such functions and maintaining a consistent naming scheme. As a part of this change, rename check_ops_valid() to check_ops_safe() for consistency. Link: https://lkml.kernel.org/r/cover.1762795245.git.lorenzo.stoakes@oracle.com Link: https://lkml.kernel.org/r/c684d91464a438d6e31172c9450416a373f10649.1762795245.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Acked-by: David Hildenbrand (Red Hat) <david@kernel.org> Reviewed-by: Davidlohr Bueso <dave@stgolabs.net> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: SeongJae Park <sj@kernel.org> Cc: Jann Horn <jannh@google.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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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.