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[media] v4l: vb2-memops: use vma slab when vma allocation
The slab for vm_area_struct which is vm_area_cachep is already prepared for the general use. Instead of kmalloc() for the vma copy for userptr, allocation from vm_area_cachep is more beneficial. CC: Hans Verkuil <hans.verkuil@cisco.com> CC: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Cho KyongHo <pullip.cho@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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