linux-kernel - [PATCH 2/3] gpu: nova-core: bitfield: simplify expression

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Message-Id: <20251022-nova-bitfield-v1-2-73bc0988667b@nvidia.com>
Date: Wed, 22 Oct 2025 19:50:57 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Edwin Peer <epeer@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>, 
 Alistair Popple <apopple@...dia.com>, 
 Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>, 
 nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
 Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH 2/3] gpu: nova-core: bitfield: simplify expression

The shift is more easily expressed by the index of the lowest bit of the
field.

Reported-by: Edwin Peer <epeer@...dia.com>
Link: https://lore.kernel.org/rust-for-linux/F3853912-2C1C-4F9B-89B0-3168689F35B3@nvidia.com/
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 drivers/gpu/nova-core/bitfield.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/nova-core/bitfield.rs b/drivers/gpu/nova-core/bitfield.rs
index 136de7289162..f113439c6501 100644
--- a/drivers/gpu/nova-core/bitfield.rs
+++ b/drivers/gpu/nova-core/bitfield.rs
@@ -268,7 +268,7 @@ impl $name {
                 _ => ::kernel::build_error!("Unsupported storage type size")
             }
         };
-        const [<$field:upper _SHIFT>]: u32 = Self::[<$field:upper _MASK>].trailing_zeros();
+        const [<$field:upper _SHIFT>]: u32 = $lo;
         );
 
         $(

-- 
2.51.0