On Mon, Aug 03, 2015 at 08:54:47AM -0700, Paul Burton wrote: > Commit cccf34e9411c ("MIPS: c-r4k: Fix cache flushing for MT cores") did > 2 things: > > - Introduced cpu_foreign_map to call cache maintenance functions on > only a single CPU within each core in the system. > > - Stopped calling cache maintenance functions on non-local CPUs for > systems which include a MIPS Coherence Manager. > > Thus the introduction of cpu_foreign_map has no effect on any systems > with a CM, since the IPIs will be avoided entirely. Thus it can only > possibly affect other systems which have multiple logical CPUs per core, > which appears to only be netlogic. I'm pretty certain this wasn't the > intent, am unsure whether avoiding such cache maintenance calls is > correct for netlogic systems and believe the overhead of calculating > cpu_foreign_map is thus unnecessary & this code is almost certainly > untested. > > This mostly reverts commit cccf34e9411c ("MIPS: c-r4k: Fix cache > flushing for MT cores"), leaving only the change for systems with a CM. BMIPS is another "hyperthreading-like" core. Maybe Kevin or Florian can comment if this patch is good for them? Ralf