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Patch series "fix error handling in mmap_region() and refactor", v3. The mmap_region() function is somewhat terrifying, with spaghetti-like control flow and numerous means by which issues can arise and incomplete state, memory leaks and other unpleasantness can occur. This series goes to great lengths to simplify how mmap_region() works and to avoid unwinding errors late on in the process of setting up the VMA for the new mapping, and equally avoids such operations occurring while the VMA is in an inconsistent state. This series builds on the previously submitted hotfix patches (see link to v2 below) which addresses the most critical issues around mmap_region(), and further works to improve mmap_region() complexity, stability, and testability. This series moves the code to mm/vma.c to render it userland testable, refactors and simplifies it into smaller functions that are significantly more readable. It additionally avoids performing an attempt at a second merge mid-way through allocating a new VMA, a dubious proposition at best and one that is highly subject to subtle bugs. Rather than do this, we simply note that we ought to retry the merge and do this as a final step. This patch (of 3): Add some additional vma_internal.h stubs in preparation for __mmap_region() being moved to mm/vma.c. Without these the move would result in the tests no longer compiling. Link: https://lkml.kernel.org/r/cover.1729858176.git.lorenzo.stoakes@oracle.com Link: https://lkml.kernel.org/r/74b27e159e261d2ac1fe66a130edad1d61fdc176.1729858176.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Jann Horn <jannh@google.com> Cc: Liam R. Howlett <Liam.Howlett@Oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Xu <peterx@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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| README | ||
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.