6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Danilo Krummrich <dakr@xxxxxxxxxx> commit 909037ce0369bc3f4fd31743fd2d8d7096f06002 upstream. 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> Reviewed-by: Benno Lossin <benno.lossin@xxxxxxxxx> Reviewed-by: Gary Guo <gary@xxxxxxxxxxx> Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx> Link: https://lore.kernel.org/r/20241004154149.93856-25-dakr@xxxxxxxxxx Signed-off-by: Miguel Ojeda <ojeda@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- rust/kernel/alloc.rs | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- 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 {
