[RFC PATCH] lib: Introduce generic __cmpxchg_u64() and use it where needed

[Eric Dumazet]

On 11/01/2018 09:32 AM, Peter Zijlstra wrote:

>> Anyhow, if the atomic maintainers are willing to stand up and state for
>> the record that the atomic counters are guaranteed to wrap modulo 2^n
>> just like unsigned integers, then I'm happy to take Paul's patch.
> 
> I myself am certainly relying on it.


Could we get uatomic_t support maybe ?

This reminds me of this sooooo silly patch :/

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=adb03115f4590baa280ddc440a8eff08a6be0cb7