From: Alexandre Courbot <acourbot@nvidia.com>
Date: Wed, 22 Oct 2025 10:50:57 +0000 (+0900)
Subject: gpu: nova-core: bitfield: simplify expression
X-Git-Tag: v6.19-rc1~157^2~8^2~55
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e6b8932b9374bd0591bb4dda3eb3e4f1cc50655e;p=thirdparty%2Fkernel%2Flinux.git

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@nvidia.com>
Link: https://lore.kernel.org/rust-for-linux/F3853912-2C1C-4F9B-89B0-3168689F35B3@nvidia.com/
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Reviewed-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Message-ID: <20251022-nova-bitfield-v1-2-73bc0988667b@nvidia.com>
---

diff --git a/drivers/gpu/nova-core/bitfield.rs b/drivers/gpu/nova-core/bitfield.rs
index 136de72891629..f113439c6501a 100644
--- a/drivers/gpu/nova-core/bitfield.rs
+++ b/drivers/gpu/nova-core/bitfield.rs
@@ -268,7 +268,7 @@ macro_rules! bitfield {
                 _ => ::kernel::build_error!("Unsupported storage type size")
             }
         };
-        const [<$field:upper _SHIFT>]: u32 = Self::[<$field:upper _MASK>].trailing_zeros();
+        const [<$field:upper _SHIFT>]: u32 = $lo;
         );
 
         $(