linux-kernel - how the mmap() work for scatter

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Message-ID: <1269135124.2517.6.camel@myhost>
Date:	Sun, 21 Mar 2010 09:32:04 +0800
From:	"Figo.zhang" <figo1802@...il.com>
To:	lkml <linux-kernel@...r.kernel.org>
Subject: how the mmap() work for scatter_sg memory?

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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