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Re: [PATCH 31/31] dma-mapping-common: skip kmemleak checks for page-less SG entries

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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.
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[PATCH 31/31] dma-mapping-common: skip kmemleak checks for page-less SG entries Christoph Hellwig <hch@lst.de> - 2015-08-12 09:20 +0200
  Re: [PATCH 31/31] dma-mapping-common: skip kmemleak checks for  page-less SG entries Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-12 18:10 +0200
    Re: [PATCH 31/31] dma-mapping-common: skip kmemleak checks for  page-less SG entries Christoph Hellwig <hch@lst.de> - 2015-08-13 16:40 +0200
  Re: [PATCH 31/31] dma-mapping-common: skip kmemleak checks for  page-less SG entries Catalin Marinas <catalin.marinas@gmail.com> - 2015-08-12 18:30 +0200

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