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@xxxxxxxxxx>
Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
---
rust/kernel/alloc.rs | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs
index 820ef6072e02..be2bd0f1e74a 100644
--- a/rust/kernel/alloc.rs
+++ b/rust/kernel/alloc.rs
@@ -34,7 +34,7 @@
/// 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 {
@@ -42,6 +42,11 @@ 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 {
--
2.45.2
