[PATCH v3 3/3] rust: atomic: update a safety comment in impl of `fetch_add`

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

The safety comment used in the implementation of `fetch_add` could be read
as just saying something it is true without justifying it. Update the
safety comment to include justification.

Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 rust/kernel/sync/atomic/internal.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/kernel/sync/atomic/internal.rs b/rust/kernel/sync/atomic/internal.rs
index a094f704be0ce..67745c44e710b 100644
--- a/rust/kernel/sync/atomic/internal.rs
+++ b/rust/kernel/sync/atomic/internal.rs
@@ -258,7 +258,7 @@ fn add[](a: &AtomicRepr<Self>, v: Self::Delta) {
         /// Atomically updates `*a` to `(*a).wrapping_add(v)`, and returns the value of `*a`
         /// before the update.
         fn fetch_add[acquire, release, relaxed](a: &AtomicRepr<Self>, v: Self::Delta) -> Self {
-            // SAFETY: `a.as_ptr()` is valid and properly aligned.
+            // SAFETY: `a.as_ptr()` guarantees the returned pointer is valid and properly aligned.
             unsafe { bindings::#call(v, a.as_ptr().cast()) }
         }
 

-- 
2.51.2