Re: [PATCH v5 1/4] rust: uaccess: add userspace pointers

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To: David Laight <David.Laight@xxxxxxxxxx>
Subject: Re: [PATCH v5 1/4] rust: uaccess: add userspace pointers
From: Alice Ryhl <aliceryhl@xxxxxxxxxx>
Date: Sun, 21 Apr 2024 20:37:38 +0200
Cc: "boqun.feng@xxxxxxxxx" <boqun.feng@xxxxxxxxx>, "a.hindborg@xxxxxxxxxxx" <a.hindborg@xxxxxxxxxxx>, "akpm@xxxxxxxxxxxxxxxxxxxx" <akpm@xxxxxxxxxxxxxxxxxxxx>, "alex.gaynor@xxxxxxxxx" <alex.gaynor@xxxxxxxxx>, "arnd@xxxxxxxx" <arnd@xxxxxxxx>, "arve@xxxxxxxxxxx" <arve@xxxxxxxxxxx>, "benno.lossin@xxxxxxxxx" <benno.lossin@xxxxxxxxx>, "bjorn3_gh@xxxxxxxxxxxxxx" <bjorn3_gh@xxxxxxxxxxxxxx>, "brauner@xxxxxxxxxx" <brauner@xxxxxxxxxx>, "cmllamas@xxxxxxxxxx" <cmllamas@xxxxxxxxxx>, "gary@xxxxxxxxxxx" <gary@xxxxxxxxxxx>, "gregkh@xxxxxxxxxxxxxxxxxxx" <gregkh@xxxxxxxxxxxxxxxxxxx>, "joel@xxxxxxxxxxxxxxxxx" <joel@xxxxxxxxxxxxxxxxx>, "keescook@xxxxxxxxxxxx" <keescook@xxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, "maco@xxxxxxxxxxx" <maco@xxxxxxxxxxx>, "ojeda@xxxxxxxxxx" <ojeda@xxxxxxxxxx>, "rust-for-linux@xxxxxxxxxxxxxxx" <rust-for-linux@xxxxxxxxxxxxxxx>, "surenb@xxxxxxxxxx" <surenb@xxxxxxxxxx>, "tkjos@xxxxxxxxxxx" <tkjos@xxxxxxxxxxx>, "viro@xxxxxxxxxxxxxxxxxx" <viro@xxxxxxxxxxxxxxxxxx>, "wedsonaf@xxxxxxxxx" <wedsonaf@xxxxxxxxx>, "willy@xxxxxxxxxxxxx" <willy@xxxxxxxxxxxxx>
In-reply-to: <5a45ccc04cae4976900d031989104737@AcuMS.aculab.com>
References: <Zh2hw0uQrkN5yVVA@boqun-archlinux> <20240416095323.1107928-1-aliceryhl@google.com> <5a45ccc04cae4976900d031989104737@AcuMS.aculab.com>

On Sun, Apr 21, 2024 at 8:08 PM David Laight <David.Laight@xxxxxxxxxx> wrote:
>
> Should you be implementing 'struct iov_iter' ?
>
> Even if it means creating an IO_UBUF for ioctls?
> (Although that might take some 'fettling' for read+write for ioctls.)

That seems to be intended for when you have several chunks of memory
in userspace that you want to treat as one contiguous chunk. That's
not something I need in the Android Binder driver.

Alice

Follow-Ups:
- RE: [PATCH v5 1/4] rust: uaccess: add userspace pointers
  - From: David Laight

References:
- Re: [PATCH v5 1/4] rust: uaccess: add userspace pointers
  - From: Boqun Feng
- Re: [PATCH v5 1/4] rust: uaccess: add userspace pointers
  - From: Alice Ryhl
- RE: [PATCH v5 1/4] rust: uaccess: add userspace pointers
  - From: David Laight

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