how the mmap() work for scatter_sg memory?

[Figo.zhang]

hi all,

i see the drm kernel source code, for SCATTER MEMORY, it use
vmalloc_32() to alloce some pages, and put them into sglist table in
drm_scatter.c. and in drm_mmap_locked(), why it not call
remap_vmalloc_range() to remap the pages to vm_area for mmap? how it
remap pages(that memory using vmalloc_32() to alloc) to vm_area? 
for consistany memory, it often call remap_pfn_range() for remap.
so i am puzzle how the mmap() is work for sg? would someone give it more
details? Thanks.

Best
Figo

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