diff options
| author | Danilo Krummrich <dakr@kernel.org> | 2024-10-04 17:41:28 +0200 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2024-10-15 23:10:32 +0200 |
| commit | 909037ce0369bc3f4fd31743fd2d8d7096f06002 (patch) | |
| tree | e5c03b85efd8a1beb30b336fc0bc1a684a9cdc54 /rust | |
| parent | 4a28ab469ff01855eb819dfd94754d1792f03f2a (diff) | |
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>
Diffstat (limited to 'rust')
| -rw-r--r-- | rust/kernel/alloc.rs | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs index 7fc2e404e594..049fca7a514d 100644 --- a/rust/kernel/alloc.rs +++ b/rust/kernel/alloc.rs @@ -35,7 +35,7 @@ use core::{alloc::Layout, ptr::NonNull}; /// 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 { |