On Wed, Aug 12, 2015 at 09:05:15AM -0700, Linus Torvalds wrote:
[ Again, I'm responding to one random patch - this pattern was
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.