> What should it do on i386? mb()?
For it to have any use in the situation I described, it would need to
writeback and invalidate the dcache for the affected range. It doesn't seem
to do so, so it seems that it isn't what I require.
The situation is simple - I have a paged RAM setup and I need it cached.
All I want to do is flush and invalidate the cache when I'm about to waggle
whatever I/O ports I waggle to change pages.
There are other situations in which I need the cache flushed, but the above
is one of the simplest.
Even flush_page_to_ram() doesn't seem to do what its name implies, on most
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