[PATCH v2 06/33] rust: bump Clippy's MSRV and clean `incompatible_msrv` allows

[Miguel Ojeda <ojeda@kernel.org>]

Following the Rust compiler bump, we can now update Clippy's MSRV we
set in the configuration, which will improve the diagnostics it generates.

Thus do so and clean a few of the `allow`s that are not needed anymore.

Reviewed-by: Tamir Duberstein <tamird@kernel.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 .clippy.toml                      | 2 +-
 drivers/gpu/nova-core/gsp/cmdq.rs | 6 +-----
 rust/kernel/ptr.rs                | 1 -
 rust/kernel/transmute.rs          | 2 --
 4 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/.clippy.toml b/.clippy.toml
index a51de9a46380..b0a78cc8be20 100644
--- a/.clippy.toml
+++ b/.clippy.toml
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
-msrv = "1.78.0"
+msrv = "1.85.0"
 
 check-private-items = true
 
diff --git a/drivers/gpu/nova-core/gsp/cmdq.rs b/drivers/gpu/nova-core/gsp/cmdq.rs
index 46819a82a51a..d9f69366642a 100644
--- a/drivers/gpu/nova-core/gsp/cmdq.rs
+++ b/drivers/gpu/nova-core/gsp/cmdq.rs
@@ -281,7 +281,6 @@ fn allocate_command(&mut self, size: usize) -> Result<GspCommand<'_>> {
         let (slice_1, slice_2) = {
             let (slice_1, slice_2) = self.driver_write_area();
 
-            #[allow(clippy::incompatible_msrv)]
             (slice_1.as_flattened_mut(), slice_2.as_flattened_mut())
         };
 
@@ -572,10 +571,7 @@ fn wait_for_msg(&self, timeout: Delta) -> Result<GspMessage<'_>> {
             Delta::from_millis(1),
             timeout,
         )
-        .map(|(slice_1, slice_2)| {
-            #[allow(clippy::incompatible_msrv)]
-            (slice_1.as_flattened(), slice_2.as_flattened())
-        })?;
+        .map(|(slice_1, slice_2)| (slice_1.as_flattened(), slice_2.as_flattened()))?;
 
         // Extract the `GspMsgElement`.
         let (header, slice_1) = GspMsgElement::from_bytes_prefix(slice_1).ok_or(EIO)?;
diff --git a/rust/kernel/ptr.rs b/rust/kernel/ptr.rs
index c7788656a162..91811f5e27de 100644
--- a/rust/kernel/ptr.rs
+++ b/rust/kernel/ptr.rs
@@ -81,7 +81,6 @@ pub const fn new_checked(align: usize) -> Option<Self> {
     /// This is equivalent to [`align_of`], but with the return value provided as an [`Alignment`].
     #[inline(always)]
     pub const fn of<T>() -> Self {
-        #![allow(clippy::incompatible_msrv)]
         // This cannot panic since alignments are always powers of two.
         //
         // We unfortunately cannot use `new` as it would require the `generic_const_exprs` feature.
diff --git a/rust/kernel/transmute.rs b/rust/kernel/transmute.rs
index 5711580c9f9b..b9e6eadc08f5 100644
--- a/rust/kernel/transmute.rs
+++ b/rust/kernel/transmute.rs
@@ -49,7 +49,6 @@ fn from_bytes(bytes: &[u8]) -> Option<&Self>
         let slice_ptr = bytes.as_ptr().cast::<Self>();
         let size = size_of::<Self>();
 
-        #[allow(clippy::incompatible_msrv)]
         if bytes.len() == size && slice_ptr.is_aligned() {
             // SAFETY: Size and alignment were just checked.
             unsafe { Some(&*slice_ptr) }
@@ -92,7 +91,6 @@ fn from_bytes_mut(bytes: &mut [u8]) -> Option<&mut Self>
         let slice_ptr = bytes.as_mut_ptr().cast::<Self>();
         let size = size_of::<Self>();
 
-        #[allow(clippy::incompatible_msrv)]
         if bytes.len() == size && slice_ptr.is_aligned() {
             // SAFETY: Size and alignment were just checked.
             unsafe { Some(&mut *slice_ptr) }
-- 
2.53.0