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Most of kernel debugging facilities take a nul-terminated string for file names for a callsite (generated from __FILE__), however the Rust courterpart, Location, would return a Rust string (not nul-terminated) from method .file(). And such a string cannot be passed to C debugging function directly. There is ongoing work to support a Location::file_with_nul() [1], which returns a nul-terminated string from a Location. Since it's still working in progress, and it will take some time before the feature finally gets stabilized and the kernel's minimal rustc version might also take a while to bump to a version that at least has that feature, introduce a file_from_location() function, which returns a warning string if Location::file_with_nul() is not available. This should work in most cases because as for now the known usage of Location::file_with_nul() is only in debugging code (e.g. might_sleep()) and there might be other information reported by the debugging code that could help locate the problematic function, so missing the file name is fine at the moment. Link: https://github.com/rust-lang/rust/issues/141727 [1] Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Link: https://lore.kernel.org/r/20250619151007.61767-2-boqun.feng@gmail.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 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.