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b314e21596
Many maple tree values output when an mt_validate() or equivalent hits an issue utilise tagged pointers, most notably parent nodes. Also some pivots/slots contain meaningful values, output as pointers, such as the index of the last entry with data for example. All pointer values such as this are destroyed by kernel pointer hashing rendering the debug output obtained from CONFIG_DEBUG_VM_MAPLE_TREE considerably less usable. Update this code to output the raw pointers using %px rather than %p when CONFIG_DEBUG_VM_MAPLE_TREE is defined. This is justified, as the use of this configuration flag indicates that this is a test environment. Userland does not understand %px, so use %p there. In an abundance of caution, if CONFIG_DEBUG_VM_MAPLE_TREE is not set, also use %p to avoid exposing raw kernel pointers except when we are positive a testing mode is enabled. This was inspired by the investigation performed in recent debugging efforts around a maple tree regression [0] where kernel pointer tagging had to be disabled in order to obtain truly meaningful and useful data. [0]:https://lore.kernel.org/all/20241001023402.3374-1-spasswolf@web.de/ Link: https://lkml.kernel.org/r/20241007115335.90104-1-lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com> Cc: Sidhartha Kumar <sidhartha.kumar@oracle.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.