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Re: [Xen-devel] Regression: x86/mm: new _PTE_SWP_SOFT_DIRTY bit conflicts with existing use

On Wed, Aug 21, 2013 at 04:04:54PM -0700, Linus Torvalds wrote:
 > On Wed, Aug 21, 2013 at 12:03 PM, Cyrill Gorcunov <gorcunov@xxxxxxxxx> wrote:
 > >
 > > I personally don't see bug here because
 > >
 > >  - this swapped page soft dirty bit is set for non-present entries only,
 > >    never for present ones, just at moment we form swap pte entry
 > >
 > >  - i don't find any code which would test for this bit directly without
 > >    is_swap_pte call
 > Ok, having gone through the places that use swp_*soft_dirty(), I have
 > to agree. Afaik, it's only ever used on a swap-entry that has (by
 > definition) the P bit clear. So with or without Xen, I don't see how
 > it can make any difference.
 > David/Konrad - did you actually see any issues, or was this just from
 > (mis)reading the code?

Could this explain what I'm seeing in another thread ?


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