From: Alexei Starovoitov alexei.starovoitov@gmail.com Date: Wed, 11 Nov 2015 09:27:00 -0800
BPF_XADD == atomic_add() in kernel. period. we are not going to deprecate it or introduce something else.
Agreed, it makes no sense to try and tie C99 or whatever atomic semantics to something that is already clearly defined to have exactly kernel atomic_add() semantics.