Previouly drivers have their own way of mapping range of kernel pages/memory into user vma and this was done by invoking vm_insert_page() within a loop.
As this pattern is common across different drivers, it can be generalized by creating a new function and use it across the drivers.
vm_insert_range is the new API which will be used to map a range of kernel memory/pages to user vma.
All the applicable places are converted to use new vm_insert_range in this patch series.
v1 -> v2: Address review comment on mm/memory.c. Add EXPORT_SYMBOL for vm_insert_range and corrected the documentation part for this API.
In drivers/gpu/drm/xen/xen_drm_front_gem.c, replace err with ret as suggested.
In drivers/iommu/dma-iommu.c, handle the scenario of partial mmap() of large buffer by passing *pages + vma->vm_pgoff* to vm_insert_range().
Souptick Joarder (9): mm: Introduce new vm_insert_range API arch/arm/mm/dma-mapping.c: Convert to use vm_insert_range drivers/firewire/core-iso.c: Convert to use vm_insert_range drm/rockchip/rockchip_drm_gem.c: Convert to use vm_insert_range drm/xen/xen_drm_front_gem.c: Convert to use vm_insert_range iommu/dma-iommu.c: Convert to use vm_insert_range videobuf2/videobuf2-dma-sg.c: Convert to use vm_insert_range xen/gntdev.c: Convert to use vm_insert_range xen/privcmd-buf.c: Convert to use vm_insert_range
arch/arm/mm/dma-mapping.c | 21 +++++-------- drivers/firewire/core-iso.c | 15 ++------- drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 20 ++---------- drivers/gpu/drm/xen/xen_drm_front_gem.c | 20 ++++-------- drivers/iommu/dma-iommu.c | 13 ++------ drivers/media/common/videobuf2/videobuf2-dma-sg.c | 23 +++++--------- drivers/xen/gntdev.c | 11 +++---- drivers/xen/privcmd-buf.c | 8 ++--- include/linux/mm_types.h | 3 ++ mm/memory.c | 38 +++++++++++++++++++++++ mm/nommu.c | 7 +++++ 11 files changed, 81 insertions(+), 98 deletions(-)