[Bug 1910] An option for architecture-specific SMP locks

[bugzilla-daemon at rtems.org]

https://www.rtems.org/bugzilla/show_bug.cgi?id=1910

--- Comment #13 from Marta Rybczynska <marta.rybczynska at kalray.eu> 2011-11-23 10:20:41 CST ---
(In reply to comment #12)
> 
> I wonder if we are missing some ingredient here to make the story complete. Are
> you using the _CPU_cache_flush_1_data_line in your target to do more work than
> just flushing a line from the data cache? If your cache_flush_1_data_line does
> some cpu-specific locking, then we need a new function and not to abuse an
> existing interface. If the cache flush is actually fixing some problem though,
> then this patch seems good to me.

The flush function doesn't do more stuff than described here: it makes sure the
value written to unlock the lock really goes to memory, because the
compare-and-swap in this case bypasses cache completely.

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