On Tue, May 15, 2018 at 07:10:21PM +0200, Peter Zijlstra wrote: > On Tue, May 15, 2018 at 04:43:33PM +0100, Mark Rutland wrote: > > I *think* the table can encode enough info to generate atomic-long.h, > > atomic-instrumented.h, and the atomic.h ordering fallbacks. I'll need to > > flesh out the table and check that we don't end up clashing with > > some of the regular fallbacks. > > Yes, details details ;-) > > > # name meta args... > > # > > # Where meta contains a string of: > > # * B - bool: returns bool, fully ordered > > # * V - void: returns void, fully ordered > > void retuns are relaxed How about: V - void: returns void, no ordering variants (implicitly relaxed) > > # * I - int: returns base type, all orderings > > # * R - return: returns base type, all orderings > > # * F - fetch: returns base type, all orderings > > # * T - try: returns bool, all orderings > > Little more verbose than mine, I think we can get there with X and XB > instead of I and T, but whatever :-) Mhmm. I found it easier to do switch-like things this way, but it works regardless. > > # Where args contains list of type[:name], where type is: > > # * v - pointer to atomic base type (atomic or atomic64) > > # * i - base type (int or long) > > # * I - pointer to base type (int or long) > > # > > add VRF i v > > sub VRF i v > > inc VRF v > > dec VRF v > > or VF i v > > and VF i v > > andnot VF i v > > xor VF i v > > xchg I v i > > cmpxchg I v i:old i:new > > try_cmpxchg T v I:old i:new > > add_and_test B i v > > sub_and_test B i v > > dec_and_test B v > > inc_and_test B v > > Cute, that [:name]. :D Thanks, Mark. -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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