linux-kernel - Re: [PATCH 2/2] arch: m68k: Add DMA mapping operations for Coldfire M5441x

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Message-ID: <Z5h9ZySKFwHRjg0O@infradead.org>
Date: Mon, 27 Jan 2025 22:47:03 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
Cc: Christoph Hellwig <hch@...radead.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Greg Ungerer <gerg@...ux-m68k.org>, linux-m68k@...ts.linux-m68k.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arch: m68k: Add DMA mapping operations for Coldfire
 M5441x

On Tue, Jan 28, 2025 at 07:43:23AM +0100, Jean-Michel Hautbois wrote:
> > It really should not be hard.  The dynamic mappings already work fine
> > as m68k is using the generic code.  So the only thing you want is
> > to dip into the glonal pool for coherent allocations. For that you
> > need to select the DMA_GLOBAL_POOL config option and fill the pool
> > with dma_init_global_coherent().
> > 
> 
> Isn't it done in patch 1/2 ? Or did I miss something ?

The point is that this is all you need.  No need for new dma ops.