On 12/12/06, Jaya Kumar <[email protected]> wrote:
I think that PTEs set up by vmalloc are marked cacheable and via the
above nopage end up as cacheable. I'm not doing DMA. So the accesses
are through the cache so I don't think cache aliasing is an issue for
this case. Please let me know if I misunderstood.
This issue is not related to DMA: there are 2 different virtual
addresses that can map the same physical address. If these 2 virtual
addresses use 2 different data cache entries then you have a cache
aliasing issue. In your case the 2 different virtual addresses are (1)
the one got by the kernel (returned by vmalloc) (2) the one got by the
application (returned by mmap).
Hope that helps.
--
Franck
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