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 new functions and use it across
the drivers.
vm_insert_range() is the API which could be used to mapped
kernel memory/pages in drivers which has considered vm_pgoff
vm_insert_range_buggy() is the API which could be used to map
range of kernel memory/pages in drivers which has not considered
vm_pgoff. vm_pgoff is passed default as 0 for those drivers.
We _could_ then at a later "fix" these drivers which are using
vm_insert_range_buggy() to behave according to the normal vm_pgoff
offsetting simply by removing the _buggy suffix on the function
name and if that causes regressions, it gives us an easy way to revert.
v1 -> v2:
Few Reviewed-by.
Updated the change log in [8/9]
In [7/9], vm_pgoff is treated in V4L2 API as a 'cookie'
to select a buffer, not as a in-buffer offset by design
and it always want to mmap a whole buffer from its beginning.
Added additional changes after discussing with Marek and
vm_insert_range could be used instead of vm_insert_range_buggy.
Souptick Joarder (9):
mm: Introduce new vm_insert_range and vm_insert_range_buggy API
arch/arm/mm/dma-mapping.c: Convert to use vm_insert_range
drivers/firewire/core-iso.c: Convert to use vm_insert_range_buggy
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_buggy
arch/arm/mm/dma-mapping.c | 22 ++----
drivers/firewire/core-iso.c | 15 +---
drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 17 +----
drivers/gpu/drm/xen/xen_drm_front_gem.c | 18 ++---
drivers/iommu/dma-iommu.c | 12 +---
drivers/media/common/videobuf2/videobuf2-core.c | 7 ++
.../media/common/videobuf2/videobuf2-dma-contig.c | 6 --
drivers/media/common/videobuf2/videobuf2-dma-sg.c | 22 ++----
drivers/xen/gntdev.c | 16 ++---
drivers/xen/privcmd-buf.c | 8 +--
include/linux/mm.h | 4 ++
mm/memory.c | 81 ++++++++++++++++++++++
mm/nommu.c | 14 ++++
13 files changed, 136 insertions(+), 106 deletions(-)
--
1.9.1
