DMA Restricted Pool


Linux Kernel Configuration
└─>Library routines
└─>DMA Restricted Pool
In linux kernel since version 5.2 (release Date: 2019-07-07)  
This enables support for restricted DMA pools which provide a level of
DMA memory protection on systems with limited hardware protection
capabilities, such as those lacking an IOMMU.

For more information see
and <kernel/dma/swiotlb.c>.
If unsure, say "n".