From: Eliot Courtney <ecourtney@nvidia.com>
Date: Thu, 29 Jan 2026 07:45:01 +0000 (+0900)
Subject: gpu: nova-core: gsp: use empty slices instead of [0..0] ranges
X-Git-Tag: v7.1-rc1~167^2~13^2~98
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f6f072d8ef06ff5d29a6bb1bade3da29a1aafeec;p=thirdparty%2Fkernel%2Flinux.git

gpu: nova-core: gsp: use empty slices instead of [0..0] ranges

The current code unnecessarily uses, for example, &before_rx[0..0] to
return an empty slice. Instead, just use an empty slice.

Signed-off-by: Eliot Courtney <ecourtney@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260129-nova-core-cmdq1-v3-3-2ede85493a27@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---

diff --git a/drivers/gpu/nova-core/gsp/cmdq.rs b/drivers/gpu/nova-core/gsp/cmdq.rs
index 0743597779f11..b88ff8ebc0986 100644
--- a/drivers/gpu/nova-core/gsp/cmdq.rs
+++ b/drivers/gpu/nova-core/gsp/cmdq.rs
@@ -232,7 +232,7 @@ impl DmaGspMem {
             // to `rx`, minus one unit, belongs to the driver.
             if rx == 0 {
                 let last = after_tx.len() - 1;
-                (&mut after_tx[..last], &mut before_tx[0..0])
+                (&mut after_tx[..last], &mut [])
             } else {
                 (after_tx, &mut before_tx[..rx])
             }
@@ -241,7 +241,7 @@ impl DmaGspMem {
             //
             // PANIC: per the invariants of `cpu_write_ptr` and `gsp_read_ptr`, `rx` and `tx` are
             // `<= MSGQ_NUM_PAGES`, and the test above ensured that `rx > tx`.
-            (after_tx.split_at_mut(rx - tx).0, &mut before_tx[0..0])
+            (after_tx.split_at_mut(rx - tx).0, &mut [])
         }
     }
 
@@ -263,8 +263,8 @@ impl DmaGspMem {
         let (before_rx, after_rx) = gsp_mem.gspq.msgq.data.split_at(rx);
 
         match tx.cmp(&rx) {
-            cmp::Ordering::Equal => (&after_rx[0..0], &after_rx[0..0]),
-            cmp::Ordering::Greater => (&after_rx[..tx], &before_rx[0..0]),
+            cmp::Ordering::Equal => (&[], &[]),
+            cmp::Ordering::Greater => (&after_rx[..tx], &[]),
             cmp::Ordering::Less => (after_rx, &before_rx[..tx]),
         }
     }