[PATCH v2 2/3] arm64: do not set SWIOTLB_NO_FORCE when swiotlb is required

[Catalin Marinas]

On Wed, May 12, 2021 at 01:18:22PM -0700, Stefano Stabellini wrote:
> From: Christoph Hellwig <hch at lst.de>
> 
> Although SWIOTLB_NO_FORCE is meant to allow later calls to swiotlb_init,
> today dma_direct_map_page returns error if SWIOTLB_NO_FORCE.
> 
> For now, without a larger overhaul of SWIOTLB_NO_FORCE, the best we can
> do is to avoid setting SWIOTLB_NO_FORCE in mem_init when we know that it
> is going to be required later (e.g. Xen requires it).
> 
> CC: boris.ostrovsky at oracle.com
> CC: jgross at suse.com
> CC: catalin.marinas at arm.com
> CC: will at kernel.org
> CC: linux-arm-kernel at lists.infradead.org
> Fixes: 2726bf3ff252 ("swiotlb: Make SWIOTLB_NO_FORCE perform no allocation")
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> Signed-off-by: Stefano Stabellini <stefano.stabellini at xilinx.com>

Acked-by: Catalin Marinas <catalin.marinas at arm.com>