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>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
 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 aabdf80e4f7b..caa0b9dfac87 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 {
-- 
2.46.0

On Thu, 12 Sep 2024 00:52:57 +0200
Danilo Krummrich <dakr@kernel.org> wrote:

> 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>
> Signed-off-by: Danilo Krummrich <dakr@kernel.org>

Reviewed-by: Gary Guo <gary@garyguo.net>

> ---
>  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 aabdf80e4f7b..caa0b9dfac87 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 {