[PATCH v2 2/2] rust: impl_flags: add bitwise operations with the underlying type

[Andreas Hindborg <a.hindborg@kernel.org>]

Add bitwise or operations between the flag value enum and the underlying
type. This is useful when manipulating flags from C API without round
tripping into the Rust flag container type:

  let mut lim: bindings::queue_limits = unsafe { core::mem::zeroed() };
  ...
  if self.write_cache {
      lim.features |= request::Feature::WriteCache;
  }

The above code would be needlessly verbose without this direct assignment
option.

Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 rust/kernel/impl_flags.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/rust/kernel/impl_flags.rs b/rust/kernel/impl_flags.rs
index 04a4b0a356df..8340740b2efb 100644
--- a/rust/kernel/impl_flags.rs
+++ b/rust/kernel/impl_flags.rs
@@ -280,6 +280,22 @@ fn not(self) -> Self::Output {
             }
         }
 
+        impl ::core::ops::BitOr<$flag> for $ty {
+            type Output = Self;
+
+            #[inline]
+            fn bitor(self, rhs: $flag) -> Self::Output {
+                self | <$flag as Into<Self>>::into(rhs)
+            }
+        }
+
+        impl ::core::ops::BitOrAssign<$flag> for $ty {
+            #[inline]
+            fn bitor_assign(&mut self, rhs: $flag) {
+                *self = *self | <$flag as Into<Self>>::into(rhs)
+            }
+        }
+
         impl $flags {
             /// Returns an empty instance where no flags are set.
             #[inline]

-- 
2.51.2