Re: [Regression] b1a000d3b8ec ("block: relax direct io memory alignment")

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To: Ming Lei <ming.lei@xxxxxxxxxx>
Subject: Re: [Regression] b1a000d3b8ec ("block: relax direct io memory alignment")
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 22 Oct 2024 09:25:41 +0200
Cc: Christoph Hellwig <hch@xxxxxx>, linux-block@xxxxxxxxxxxxxxx, Keith Busch <kbusch@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>
In-reply-to: <Zxb-EWevBxzjbYL3@fedora>
References: <Zw6a7SlNGMlsHJ19@fedora> <20241016080419.GA30713@lst.de> <Zw958YtMExrNhUxy@fedora> <20241016123153.GA18219@lst.de> <Zxb-EWevBxzjbYL3@fedora>
User-agent: Mutt/1.5.17 (2007-11-01)

On Tue, Oct 22, 2024 at 09:21:21AM +0800, Ming Lei wrote:
> Can you take coherent DMA into account on kernel/dma/debug.c first?

We intentionally don't to force people to write portable code.

> Otherwise the warning still may be triggered on coherent DMA.

Well, it is a valid warning for the above reason.

References:
- [Regression] b1a000d3b8ec ("block: relax direct io memory alignment")
  - From: Ming Lei
- Re: [Regression] b1a000d3b8ec ("block: relax direct io memory alignment")
  - From: Christoph Hellwig
- Re: [Regression] b1a000d3b8ec ("block: relax direct io memory alignment")
  - From: Ming Lei
- Re: [Regression] b1a000d3b8ec ("block: relax direct io memory alignment")
  - From: Christoph Hellwig
- Re: [Regression] b1a000d3b8ec ("block: relax direct io memory alignment")
  - From: Ming Lei

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