dma-direct: document the zone selection logic
authorChristoph Hellwig <hch@lst.de>
Mon, 1 Oct 2018 14:40:53 +0000 (07:40 -0700)
committerChristoph Hellwig <hch@lst.de>
Tue, 9 Oct 2018 05:43:25 +0000 (07:43 +0200)
commit79ac32a427f5d1211fa417021fd04c36f63ab917
treec203a3573214892eadaad406498bdb0a8a66db35
parent99c65fa7c59ff558e70db8aa61bbdece5d3a9588
dma-direct: document the zone selection logic

What we are doing here isn't quite obvious, so add a comment explaining
it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
kernel/dma/direct.c