linux-kernel - Re: [PATCH] dma/mapping.c: dev_dbg support for dma_addressing

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Message-ID: <Z_zuL6tIjeTLTNKK@infradead.org>
Date: Mon, 14 Apr 2025 04:14:55 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Balbir Singh <balbirs@...dia.com>
Cc: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	Christian König <christian.koenig@....com>,
	Ingo Molnar <mingo@...nel.org>, Kees Cook <kees@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Alex Deucher <alexander.deucher@....com>,
	Bert Karwatzki <spasswolf@....de>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] dma/mapping.c: dev_dbg support for dma_addressing_limited

On Mon, Apr 14, 2025 at 09:06:46PM +1000, Balbir Singh wrote:
> +	dev_dbg(dev, "might have lower perf due to bounce buffering\n");

I don't think that's a good message.  Report the actual observation,
i.e. "device is DMA addressing limited" and not a guessed conclusion.