Hi Brendan,
I love your patch! Yet something to improve:
[auto build test ERROR on bpf-next/master]
url:
https://github.com/0day-ci/linux/commits/Brendan-Jackman/bpf-x86-Factor-out-emission-of-ModR-M-for-reg-off/20210113-004228
base:
A subsequent patch will add additional atomic operations. These new
operations will use the same opcode field as the existing XADD, with
the immediate discriminating different operations.
In preparation, rename the instruction mode BPF_ATOMIC and start
calling the zero immediate BPF_ADD.
This is
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