27 Aug
2012
27 Aug
'12
8:29 a.m.
On Mon, Aug 27, 2012 at 04:23:31PM +0800, zhangfei gao wrote:
On Mon, Aug 27, 2012 at 1:46 PM, Haojian Zhuang haojian.zhuang@gmail.com wrote:
Let me summerize it. First, user space address is mapped. Then, flushing user space address is triggered. It's a workaround of fixing non-existed virtual address without fixing vmap() or any other solution. It's just a quick fix.
Zhangfei, I doubt that the issue may be caused by missing memory barrier. Flushing is using coprocessor instructions. It's a little different.
Is there any limitation that dmac_map_area & dmac_flush_range supporting addr mapped from user space?
They DEFINITELY DO NOT SUPPORT FLUSHING USER SPACE.