linux-kernel - Re: [PATCH v3 4/4] dma-mapping: remove unused mapping resource callbacks

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Message-ID: <20250916184923.GX1086830@nvidia.com>
Date: Tue, 16 Sep 2025 15:49:23 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Leon Romanovsky <leon@...nel.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
	Leon Romanovsky <leonro@...dia.com>, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH v3 4/4] dma-mapping: remove unused mapping resource
 callbacks

On Tue, Sep 16, 2025 at 10:32:07AM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> After ARM conversion to use physical addresses for the mapping,
> there is no in-kernel users for map_resource/unmap_resource callbacks,
> so remove it.
> 
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---
>  include/linux/dma-map-ops.h |  6 ------
>  kernel/dma/mapping.c        | 16 ++++------------
>  2 files changed, 4 insertions(+), 18 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Looks like xen_swiotlb_dma_ops will be easy enough to fix..

Jason