On Thu, 05 Jul 2007 13:19:41 +1000
Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:
From what I can work out, it is something like "at this point the page
should be uptodate, so at least the icache won't contain *inconsistent*
data, just old data which userspace should take care of flushing if it
modifies". Is that always true?
I think it's true. But, in this case, i-cache doesn't contain *incositent* data.
There are inconsistency between L2-Dcache and L3-mixed-cache. At L2-icache-miss,
a cpu fetches data from L3 cache.
This case seems defficult to be generalized...
If there is something in the icache line that isn't the last data to
be stored at that address, isn't that inconsistent?
Hmm..do we have a chance to add do_flush_cache_if_not_filled_by_dma(page)
before SetPageUptodate(page) ?