Messages in this thread | | | Subject | Re: [PATCH 0/3] Add OMAP hardware spinlock misc driver | From | Peter Zijlstra <> | Date | Mon, 18 Oct 2010 16:33:03 +0200 |
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On Mon, 2010-10-18 at 16:28 +0200, Ohad Ben-Cohen wrote: > On Mon, Oct 18, 2010 at 3:43 PM, Peter Zijlstra <peterz@infradead.org> wrote: > > Right, so the problem is that there simply is no way to do atomic memory > > access from these auxiliary processing units wrt the main CPU? > > Yes. There are a few relevant system-wide limitations, one of them is > that simply the system interconnect does not support those fancy > atomic operations.
Does it support full memory coherency though? Otherwise I can see memory based message passing becoming rather interesting.
Without coherency everybody needs to be damn sure to flush the relevant bits before unlocking and such.
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