linux-kernel - Re: [PATCH 1/2] uio: introduce UIO_MEM_DMA

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Date: Thu, 1 Feb 2024 07:03:58 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Christoph Hellwig <hch@....de>
Cc: Chris Leech <cleech@...hat.com>, Nilesh Javali <njavali@...vell.com>,
	John Meneghini <jmeneghi@...hat.com>, Lee Duncan <lduncan@...e.com>,
	Mike Christie <michael.christie@...cle.com>,
	Hannes Reinecke <hare@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	GR-QLogic-Storage-Upstream@...vell.com
Subject: Re: [PATCH 1/2] uio: introduce UIO_MEM_DMA_COHERENT type

On Thu, Feb 01, 2024 at 05:46:37AM +0100, Christoph Hellwig wrote:
> As the least horrible way out this looks ok:
> 
> Reviewed-by: Christoph Hellwig <hch@....de>
> 
> Bt maybe you can add some commentary why this mem mode exists and
> why no one should be using it in new code?
> 

Good idea, and perhaps a kernel log warning when this is used as well
just to prevent anyone new from ever considering it.

thanks,

greg k-h