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rust: alloc: implement contains for Flags

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Provide a simple helper function to check whether given flags do
contain one or multiple other flags.

This is used by a subsequent patch implementing the Cmalloc `Allocator`
to check for __GFP_ZERO.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://lore.kernel.org/r/20241004154149.93856-25-dakr@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Danilo Krummrich 2024-10-04 17:41:28 +02:00 committed by Miguel Ojeda
parent 4a28ab469f
commit 909037ce03
1 changed files with 6 additions and 1 deletions
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7
rust/kernel/alloc.rs
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@ -35,7 +35,7 @@
/// They can be combined with the operators `|`, `&`, and `!`.
///
/// Values can be used from the [`flags`] module.
#[derive(Clone, Copy)]
#[derive(Clone, Copy, PartialEq)]
pub struct Flags(u32);
impl Flags {
@ -43,6 +43,11 @@ impl Flags {
pub(crate) fn as_raw(self) -> u32 {
self.0
}
/// Check whether `flags` is contained in `self`.
pub fn contains(self, flags: Flags) -> bool {
(self & flags) == flags
}
}
impl core::ops::BitOr for Flags {