* Re: [PATCH bpf-next v4 0/3] bpf, x86: Support fetching AND/OR/XOR atomics in arena
[not found] <20261014125017.1426212-1-puranjay@kernel.org>
@ 2026-10-15 17:06 ` Tejun Heo
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From: Tejun Heo @ 2026-10-15 17:06 UTC (permalink / raw)
To: Puranjay Mohan
Cc: bpf, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko,
Martin KaFai Lau, Eduard Zingerman, Kumar Kartikeya Dwivedi,
Song Liu, Yonghong Song, David Vernet, Andrea Righi,
Changwoo Min, sched-ext, linux-kernel
Hello, Puranjay.
On Wed, Oct 14, 2026 at 05:50:10AM -0700, Puranjay Mohan wrote:
> A fetching AND/OR/XOR against arena memory is rejected on x86-64:
>
> BPF_ATOMIC stores into R1 arena is not allowed
- 1/3: A fetching atomic through a number now fails to load with an
empty verifier log, where it used to get the message above. That
seems problematic. Can that case keep an error message?
- 3/3: sched_ext/for-7.4 already synced a cid.bpf.h from scx which
probes for the fetching atomics and keeps the CAS loop as the
old-kernel fallback, so this conflicts with it. I'll pull
bpf/for-next into sched_ext/for-7.4 and we can do the modifications
on top.
For 1/3 and 2/3,
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
--
tejun
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