[ofa-general] Re: [PATCH 14 of 33] IB/ipath - fix port sharing on powerpc
rdreier at cisco.com
Tue Apr 10 15:32:19 PDT 2007
I applied this, but I still think there's some more work to do in this
> The port sharing feature mixed kernel virtual addresses as well as
> physical addresses for the offset used to describe the mmap address to map
> the InfiniPath hardware into user space. This had a conflict on powerpc.
> The new scheme converts it to a physical address so it doesn't conflict
> with chip addresses and yet still fits in 40/44 bits so it isn't truncated
> by 32-bit applications calling mmap64().
there's no guarantee that a physical address fits in 40 or 44 or 63
bits on a 64 bit platform. So you've fixed this problem on the
platforms you test for now, but it could easily crop up again...
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