Question on mutex code

[Davidlohr Bueso]

On Sat, 2015-03-14 at 18:03 -0700, Davidlohr Bueso wrote:
> Good analysis, but not quite accurate for one simple fact: mutex
> trylocks _only_ use fastpaths (obviously just depend on the counter
> cmpxchg to 0), so you never fallback to the slowpath you are mentioning,
> thus the race is non existent. Please see the arch code.

For debug we use the trylock slowpath, but so does everything else, so
again you cannot hit this scenario.