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Retire missing `ptr::sub` in `mm/io.rs`

This commit is contained in:
Ruihan Li 2025-07-29 14:43:03 +08:00 committed by Tate, Hongliang Tian
parent aa7aca3dde
commit 275fd21650
1 changed files with 4 additions and 8 deletions
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12
ostd/src/mm/io.rs
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@ -610,11 +610,9 @@ impl VmReader<'_, Fallible> {
let mut writer = VmWriter::from(val.as_bytes_mut());
self.read_fallible(&mut writer)
.map_err(|(err, copied_len)| {
// SAFETY: The `copied_len` is the number of bytes read so far.
// The `copied_len` is the number of bytes read so far.
// So the `cursor` can be moved back to the original position.
unsafe {
self.cursor = self.cursor.sub(copied_len);
}
self.cursor = self.cursor.wrapping_sub(copied_len);
err
})?;
Ok(val)
@ -836,11 +834,9 @@ impl VmWriter<'_, Fallible> {
let mut reader = VmReader::from(new_val.as_bytes());
self.write_fallible(&mut reader)
.map_err(|(err, copied_len)| {
// SAFETY: The `copied_len` is the number of bytes written so far.
// The `copied_len` is the number of bytes written so far.
// So the `cursor` can be moved back to the original position.
unsafe {
self.cursor = self.cursor.sub(copied_len);
}
self.cursor = self.cursor.wrapping_sub(copied_len);
err
})?;
Ok(())