[PATCH] powerpc/32: drop unused ISA_DMA_THRESHOLD

[Christoph Hellwig]

On Mon, Nov 25, 2019 at 11:20:33AM +0200, Mike Rapoport wrote:
> From: Mike Rapoport <rppt at linux.ibm.com>
> 
> The ISA_DMA_THRESHOLD variable is set by several platforms but never
> referenced.
> Remove it.

Looks good:

Reviewed-by: Christoph Hellwig <hch at lst.de>