rust: macros: add if_cfg! macro for config-based conditionals#1218
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KaiserGranatapfel wants to merge 1 commit intoRust-for-Linux:rust-nextfrom
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rust: macros: add if_cfg! macro for config-based conditionals#1218KaiserGranatapfel wants to merge 1 commit intoRust-for-Linux:rust-nextfrom
KaiserGranatapfel wants to merge 1 commit intoRust-for-Linux:rust-nextfrom
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Self-review
- Code compiles and passes formatting/linting checks
- Macro implementation follows existing kernel macro patterns
- Documentation complete with examples
- Tested with existing conditional compilation patterns in
time.rs
Ready for review.
This macro simplifies conditional compilation patterns by providing a
more readable syntax for selecting code based on kernel configuration
options. It replaces verbose #[cfg(...)] and #[cfg(not(...))] blocks
with a cleaner if_cfg!(if CONFIG_FOO { expr1 } else { expr2 }) syntax.
The macro works in both expression and statement positions, making it
versatile for various use cases throughout the kernel.
Examples of usage:
- Expression: let value = if_cfg!(if CONFIG_64BIT { x / y } else { unsafe { div64_s64(x, y) } });
- Statement: if_cfg!(if CONFIG_FOO { let x = 1; } else { let x = 2; });
This implementation also includes updates to rust/kernel/time.rs to
demonstrate the macro's usage, replacing several instances of the
verbose conditional compilation pattern.
Suggested-by: Rust-for-Linux Issue Rust-for-Linux#1183 <Rust-for-Linux#1183>
Link: Rust-for-Linux#1183
Signed-off-by: KaiserGranatapfel <christopher.erleigh@gmail.com>
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Note that we don't use PRs anymore (you can leave it open if you think it is useful for some reason, though). I see you sent the patch to the mailing list but it didn't arrive there: https://lore.kernel.org/rust-for-linux/CANiq72nMpO0o-P0BbTgxPU4RSOttFPc4UQzH9Bs73F7Bnkyxmg@mail.gmail.com/ Thanks! |
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Description
This PR implements the
if_cfg!macro as requested in issue #1183. The macro simplifies conditional compilation patterns by providing a more readable syntax for selecting code based on kernel configuration options.Changes
if_cfg!macro torust/kernel/lib.rsrust/kernel/time.rsto demonstrate usage (4 instances replaced)Benefits
#[cfg(...)]/#[cfg(not(...))]blocksTesting
rustfmtRelated
Closes #1183