linux-kernel - Re: [PATCH v2 4/4] rust: add abstraction for `struct page`

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Date: Tue, 27 Feb 2024 16:56:51 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	Kees Cook <keescook@...omium.org>, Al Viro <viro@...iv.linux.org.uk>, 
	Andrew Morton <akpm@...ux-foundation.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Arve Hjønnevåg <arve@...roid.com>, 
	Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>, 
	Joel Fernandes <joel@...lfernandes.org>, Carlos Llamas <cmllamas@...gle.com>, 
	Suren Baghdasaryan <surenb@...gle.com>, Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH v2 4/4] rust: add abstraction for `struct page`

On Tue, Feb 27, 2024 at 4:37 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Thu, Feb 08, 2024 at 03:47:54PM +0000, Alice Ryhl wrote:
> > +impl Page {
> > +    /// Allocates a new page.
> > +    pub fn new() -> Result<Self, AllocError> {
> > +        // SAFETY: These are the correct arguments to allocate a single page.
> > +        let page = unsafe {
> > +            bindings::alloc_pages(
> > +                bindings::GFP_KERNEL | bindings::__GFP_ZERO | bindings::__GFP_HIGHMEM,
>
> I thought I raised this last time, but this is over-specialised for
> Binder's purposes.  Many places that want to allocate a page want
> different GFP flags from this; they shouldn't even be the default flags.
> So either what you're defining here is a BinderPage, or new() needs
> to take GFP flags.

Ah, yeah, sorry. I never got around to figuring that out.

I can change it to take GFP flags.

Thank you for taking another look!
Alice