linux-kernel - Re: [PATCH sched_ext/for-6.18-fixes] sched_ext: Mark scx_bpf_dsq_move_set_[slice|vtime]() with KF

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Message-ID: <aOSfyDN_7RuGc75j@gpd4>
Date: Tue, 7 Oct 2025 07:06:16 +0200
From: Andrea Righi <arighi@...dia.com>
To: Tejun Heo <tj@...nel.org>
Cc: David Vernet <void@...ifault.com>, Changwoo Min <changwoo@...lia.com>,
	sched-ext@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH sched_ext/for-6.18-fixes] sched_ext: Mark
 scx_bpf_dsq_move_set_[slice|vtime]() with KF_RCU

On Mon, Oct 06, 2025 at 03:35:36PM -1000, Tejun Heo wrote:
> scx_bpf_dsq_move_set_slice() and scx_bpf_dsq_move_set_vtime() take a DSQ
> iterator argument which has to be valid. Mark them with KF_RCU.
> 
> Fixes: 4c30f5ce4f7a ("sched_ext: Implement scx_bpf_dispatch[_vtime]_from_dsq()")
> Cc: stable@...r.kernel.org # v6.12+
> Signed-off-by: Tejun Heo <tj@...nel.org>

Makes sense to me.

Acked-by: Andrea Righi <arighi@...dia.com>

Thanks,
-Andrea

> ---
>  kernel/sched/ext.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> --- a/kernel/sched/ext.c
> +++ b/kernel/sched/ext.c
> @@ -5688,8 +5688,8 @@ BTF_KFUNCS_START(scx_kfunc_ids_dispatch)
>  BTF_ID_FLAGS(func, scx_bpf_dispatch_nr_slots)
>  BTF_ID_FLAGS(func, scx_bpf_dispatch_cancel)
>  BTF_ID_FLAGS(func, scx_bpf_dsq_move_to_local)
> -BTF_ID_FLAGS(func, scx_bpf_dsq_move_set_slice)
> -BTF_ID_FLAGS(func, scx_bpf_dsq_move_set_vtime)
> +BTF_ID_FLAGS(func, scx_bpf_dsq_move_set_slice, KF_RCU)
> +BTF_ID_FLAGS(func, scx_bpf_dsq_move_set_vtime, KF_RCU)
>  BTF_ID_FLAGS(func, scx_bpf_dsq_move, KF_RCU)
>  BTF_ID_FLAGS(func, scx_bpf_dsq_move_vtime, KF_RCU)
>  BTF_KFUNCS_END(scx_kfunc_ids_dispatch)
> @@ -5820,8 +5820,8 @@ __bpf_kfunc_end_defs();
>  
>  BTF_KFUNCS_START(scx_kfunc_ids_unlocked)
>  BTF_ID_FLAGS(func, scx_bpf_create_dsq, KF_SLEEPABLE)
> -BTF_ID_FLAGS(func, scx_bpf_dsq_move_set_slice)
> -BTF_ID_FLAGS(func, scx_bpf_dsq_move_set_vtime)
> +BTF_ID_FLAGS(func, scx_bpf_dsq_move_set_slice, KF_RCU)
> +BTF_ID_FLAGS(func, scx_bpf_dsq_move_set_vtime, KF_RCU)
>  BTF_ID_FLAGS(func, scx_bpf_dsq_move, KF_RCU)
>  BTF_ID_FLAGS(func, scx_bpf_dsq_move_vtime, KF_RCU)
>  BTF_KFUNCS_END(scx_kfunc_ids_unlocked)
>