Commit 909037ce authored Oct 04, 2024 by Danilo Krummrich Committed by Miguel Ojeda Oct 15, 2024

rust: alloc: implement `contains` for `Flags`



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>

parent 4a28ab46

rust/kernel/alloc.rs

+6 −1

Original line number	Diff line number	Diff line
		@@ -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 {