Re: [PATCH 31/31] dma-mapping-common: skip kmemleak checks for page-less SG entries
From: Christoph Hellwig <hch@lst.de>
Date: 2015-08-13 14:33:34
Also in:
linux-alpha, linux-arch, linux-media, linux-mips, linux-s390, lkml, nvdimm, sparclinux
On Wed, Aug 12, 2015 at 09:05:15AM -0700, Linus Torvalds wrote:
[ Again, I'm responding to one random patch - this pattern was in other patches too. ] A question: do we actually expect to mix page-less and pageful SG entries in the same SG list? How does that happen?
Both for DAX and the video buffer case people could do direct I/O spanning the boundary between such a VMA and a normal one unless we add special code to prevent that. Right now I don't think it's all that useful, but then again it doesn't seem harmful either and adding those checks might add up.