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From: Tejun Heo <tj@kernel.org>
To: ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net,
	eddyz87@gmail.com, memxor@gmail.com
Cc: martin.lau@linux.dev, emil@etsalapatis.com, void@manifault.com,
	arighi@nvidia.com, changwoo@igalia.com, bpf@vger.kernel.org,
	sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCHSET SLOP RFC 6/6] sched_ext: Convert scx_bpf_cid_override() to take an arena pointer
Date: Mon, 13 Jul 2026 09:38:36 -1000	[thread overview]
Message-ID: <053a03ca896099034d6d583e8d566cc2@kernel.org> (raw)
In-Reply-To: <20260713025916.68A941F000E9@smtp.kernel.org>

On the pre-existing READ_ONCE() note:

Agreed as hardening for concurrently-writable arena memory (in practice c
is a register-held local, so the reload doesn't happen, but READ_ONCE()
is the more robust idiom). This is a NOT_SIGNED_OFF demo; I'll add it in
the sched_ext rework after bpf-next is pulled in, not in this RFC patch.

Thanks.

      reply	other threads:[~2026-07-13 19:38 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-13  2:44 [PATCHSET SLOP RFC 0/6] bpf: make arena pointers first-class kfunc and struct_ops arguments Tejun Heo
2026-07-13  2:44 ` [PATCHSET SLOP RFC 1/6] bpf: Support __arena suffix for kfunc arguments Tejun Heo
2026-07-13  2:58   ` sashiko-bot
2026-07-13 19:38     ` Tejun Heo
2026-07-13 21:45   ` Kumar Kartikeya Dwivedi
2026-07-13  2:44 ` [PATCHSET SLOP RFC 2/6] selftests/bpf: Add kfunc __arena argument tests Tejun Heo
2026-07-13  3:16   ` sashiko-bot
2026-07-13 19:38     ` Tejun Heo
2026-07-13  2:44 ` [PATCHSET SLOP RFC 3/6] bpf: Support __arena suffix on struct_ops stub arguments Tejun Heo
2026-07-13  2:59   ` sashiko-bot
2026-07-13 19:37   ` [PATCH v2 " Tejun Heo
2026-07-13  2:44 ` [PATCHSET SLOP RFC 4/6] selftests/bpf: Add struct_ops __arena argument tests Tejun Heo
2026-07-13  2:55   ` sashiko-bot
2026-07-13 19:38     ` Tejun Heo
2026-07-13  2:44 ` [PATCHSET SLOP RFC 5/6] sched_ext: Pass a kernel arena pointer to ops_cid.set_cmask() Tejun Heo
2026-07-13  2:44 ` [PATCHSET SLOP RFC 6/6] sched_ext: Convert scx_bpf_cid_override() to take an arena pointer Tejun Heo
2026-07-13  2:59   ` sashiko-bot
2026-07-13 19:38     ` Tejun Heo [this message]

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