linux-kernel - Re: [PATCH v11 2/3] rust: add dma coherent allocator abstraction.

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Message-ID: <CAH5fLgjZiux1_=dNuZN+7SEY6fUGMDNLoJNTwmHcB=WbKChwzw@mail.gmail.com>
Date: Tue, 28 Jan 2025 11:25:32 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Daniel Almeida <daniel.almeida@...labora.com>
Cc: Abdiel Janulgue <abdiel.janulgue@...il.com>, rust-for-linux@...r.kernel.org, 
	dakr@...nel.org, robin.murphy@....com, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...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@...nel.org>, 
	Trevor Gross <tmgross@...ch.edu>, Valentin Obst <kernel@...entinobst.de>, 
	open list <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>, 
	Marek Szyprowski <m.szyprowski@...sung.com>, airlied@...hat.com, 
	"open list:DMA MAPPING HELPERS" <iommu@...ts.linux.dev>
Subject: Re: [PATCH v11 2/3] rust: add dma coherent allocator abstraction.

On Tue, Jan 28, 2025 at 11:23 AM Daniel Almeida
<daniel.almeida@...labora.com> wrote:
>
> Alice,
>
> >
> > The difference is exactly that - you reduce the amount of data copied
> > to just the size of the field.
> >
> > Alice
> >
>
>
> Is your idea to have that *in addition* to the safe methods?
>
> How does it work when you want to read a T at a time?

I mean, I imagine that you could make the syntax
`dma_read!(my_alloc[7])` read the entire struct. I'm not sure which
safe methods you are referring to, because right now there is only the
unsafe as_slice().

Alice