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5bc818419a
Currently `ForeignOwnable::from_foreign()` only works for non-null
pointers for the existing `impl`s (e.g. `Box`, `Arc`). In turn, this
means callers may write code like:
```rust
// `p` is a pointer that may be null.
if p.is_null() {
None
} else {
unsafe { Some(Self::from_foreign(ptr)) }
}
```
Add a `try_from_foreign()` method to the trait with a default
implementation that returns `None` if `ptr` is null, otherwise
`Some(from_foreign(ptr))`, so that it can be used by callers instead.
Link: https://github.com/Rust-for-Linux/linux/issues/1057
Signed-off-by: Obei Sideg <linux@obei.io>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Link: https://lore.kernel.org/r/0100018d53f737f8-80c1fe97-0019-40d7-ab69-b1b192785cd7-000000@email.amazonses.com
[ Fixed intra-doc links, improved `SAFETY` comment and reworded commit. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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 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.