Hi,
On 2012-11-21 16:22, Jello huang wrote:
HI Tomi,
we need one rank of cma to allocate the memory for driver in kernel
space .And the default CMA is for allocating memory frome usespace.So
if we allocate the memory from the
default CMA zone ,there maybe introduce fragmention to the default CMA
zone.The kernel space memory donot touch the memory from userspace
Can you elaborate a bit? I didn't understand your point. Are you saying
each kernel driver that uses dma_alloc should have their own CMA zone?
That doesn't make sense...
How do you allocate CMA memory from userspace?
Tomi
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