Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
rust: uaccess: generalize write_dma() to accept any Coherent<T>
Generalize write_dma() from &Coherent<[u8]> to &Coherent<T> where
T: KnownSize + AsBytes + ?Sized. The function body only uses as_ptr()
and size(), which work for any such T, so there is no reason to
restrict it to byte slices.
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Acked-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20260325003921.3420-1-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
+7
-1
+7
-1
rust/kernel/uaccess.rs
+7
-1
rust/kernel/uaccess.rs
···
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ffi::{c_char, c_void},
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fs::file,
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prelude::*,
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+
ptr::KnownSize,
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transmute::{AsBytes, FromBytes},
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};
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use core::mem::{size_of, MaybeUninit};
···
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/// writer.write_dma(alloc, 0, 256)
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/// }
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/// ```
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-
pub fn write_dma(&mut self, alloc: &Coherent<[u8]>, offset: usize, count: usize) -> Result {
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+
pub fn write_dma<T: KnownSize + AsBytes + ?Sized>(
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+
&mut self,
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+
alloc: &Coherent<T>,
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+
offset: usize,
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+
count: usize,
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+
) -> Result {
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let len = alloc.size();
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if offset.checked_add(count).ok_or(EOVERFLOW)? > len {
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return Err(ERANGE);