From e6c32c7b926da6b7c766dc8ed32c45debc5e17a4 Mon Sep 17 00:00:00 2001
From: Faith Ekstrand <faith.ekstrand@collabora.com>
Date: Tue, 19 Aug 2025 11:28:44 -0400
Subject: [PATCH] nil/copy: Use saturating_sub() instead of doing it manually

Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36849>
---
 src/nouveau/nil/copy.rs | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/nouveau/nil/copy.rs b/src/nouveau/nil/copy.rs
index f4f706138de..6d93e34198b 100644
--- a/src/nouveau/nil/copy.rs
+++ b/src/nouveau/nil/copy.rs
@@ -321,11 +321,7 @@ fn chunk_range(
     chunk_len: u32,
 ) -> Range<u32> {
     debug_assert!(chunk_start < whole.end);
-    let start = if chunk_start < whole.start {
-        whole.start - chunk_start
-    } else {
-        0
-    };
+    let start = whole.start.saturating_sub(chunk_start);
     let end = std::cmp::min(whole.end - chunk_start, chunk_len);
     start..end
 }