Re: [PATCH 1/2] mm: provide a find_special_page vma operation

2015-01-22 Thread Andrew Morton
On Mon, 19 Jan 2015 15:47:22 + David Vrabel wrote: > The optional find_special_page VMA operation is used to lookup the > pages backing a VMA. This is useful in cases where the normal > mechanisms for finding the page don't work. This is only called if > the PTE is special. > > One use

Re: [PATCH 1/2] mm: provide a find_special_page vma operation

2015-01-22 Thread Andrew Morton
On Mon, 19 Jan 2015 15:47:22 + David Vrabel david.vra...@citrix.com wrote: The optional find_special_page VMA operation is used to lookup the pages backing a VMA. This is useful in cases where the normal mechanisms for finding the page don't work. This is only called if the PTE is

[PATCH 1/2] mm: provide a find_special_page vma operation

2015-01-19 Thread David Vrabel
The optional find_special_page VMA operation is used to lookup the pages backing a VMA. This is useful in cases where the normal mechanisms for finding the page don't work. This is only called if the PTE is special. One use case is a Xen PV guest mapping foreign pages into userspace. In a Xen

[PATCH 1/2] mm: provide a find_special_page vma operation

2015-01-19 Thread David Vrabel
The optional find_special_page VMA operation is used to lookup the pages backing a VMA. This is useful in cases where the normal mechanisms for finding the page don't work. This is only called if the PTE is special. One use case is a Xen PV guest mapping foreign pages into userspace. In a Xen