Re: [PATCH 2/2] arm64: bpf: add BPF XADD instruction

From: David Miller
Date: Wed Nov 11 2015 - 14:01:54 EST

From: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>
Date: Wed, 11 Nov 2015 10:11:33 -0800

> bpf_xadd was never meant to be __sync_fetch_and_add equivalent.
> From the day one it meant to be atomic_add() as kernel does it.


> I did piggy back on __sync in the llvm backend because it was the quick
> and dirty way to move forward.
> In retrospect I should have introduced a clean intrinstic for that instead,
> but it's not too late to do it now. user space we can change at any time
> unlike kernel.

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