Re: [PATCH v3] swiotlb: Make SWIOTLB_NO_FORCE perform no allocation

[Christoph Hellwig]

On Mon, Mar 22, 2021 at 06:53:49PM -0700, Florian Fainelli wrote:
> When SWIOTLB_NO_FORCE is used, there should really be no allocations of
> default_nslabs to occur since we are not going to use those slabs. If a
> platform was somehow setting swiotlb_no_force and a later call to
> swiotlb_init() was to be made we would still be proceeding with
> allocating the default SWIOTLB size (64MB), whereas if swiotlb=noforce
> was set on the kernel command line we would have only allocated 2KB.
> 
> This would be inconsistent and the point of initializing default_nslabs
> to 1, was intended to allocate the minimum amount of memory possible, so
> simply remove that minimal allocation period.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>

Looks good,

Reviewed-by: Christoph Hellwig <hch@xxxxxx>