Hi, Since Linus hated on cmpxchg_double(), a few patches to get rid of it, as proposed here: https://lkml.kernel.org/r/Y2U3WdU61FvYlpUh@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx based on tip/master because Linus' tree is moving a wee bit fast at the moment. 0day robot is all green for building, very limited testing on arm64/s390 for obvious raisins -- I tried to get the asm right, but please, double check.
