[ofa-general] mapping kernel memory to userspace in <= 2.6.14

[Steve Wise]

On Tue, 2007-03-13 at 13:03 -0700, Bryan O'Sullivan wrote:
> Steve Wise wrote:
> 
> > My guess is ehca and ipath have similar issues on these older kernels. 
> 
> No.  We worked through all of that a long, long time ago.
> 
> 	<b

Care to explain how?  I see in ipath_mmap_mem() you call
remap_pfn_range() to map memory that was allocated via
dma_alloc_coherent().  

What I've found is that this isn't sufficient.  You need to also reserve
the pages of that memory for kernels < 2.6.15.

Maybe I'm missing where you do this?

Maybe you don't really do kernel bypass like cxgb3 is doing?