linux-kernel - Re: [PATCH sched_ext/for-6.15] tools/sched_ext: Provide a compatible helper for scx_bpf

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Message-ID: <Z8CSb4qe3xwx5Rdm@slm.duckdns.org>
Date: Thu, 27 Feb 2025 06:27:27 -1000
From: Tejun Heo <tj@...nel.org>
To: Andrea Righi <arighi@...dia.com>
Cc: David Vernet <void@...ifault.com>, Changwoo Min <changwoo@...lia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH sched_ext/for-6.15] tools/sched_ext: Provide a compatible
 helper for scx_bpf_events()

On Thu, Feb 27, 2025 at 10:11:38AM +0100, Andrea Righi wrote:
> Introduce __COMPAT_scx_bpf_events() to use scx_bpf_events() in a
> compatible way also with kernels that don't provide this kfunc.
> 
> This also fixes the following error with scx_qmap when running on a
> kernel that does not provide scx_bpf_events():
> 
>  ; scx_bpf_events(&events, sizeof(events)); @ scx_qmap.bpf.c:777
>  318: (b7) r2 = 72                     ; R2_w=72 async_cb
>  319: <invalid kfunc call>
>  kfunc 'scx_bpf_events' is referenced but wasn't resolved
> 
> Fixes: 9865f31d852a4 ("sched_ext: Add scx_bpf_events() and scx_read_event() for BPF schedulers")
> Signed-off-by: Andrea Righi <arighi@...dia.com>

Applied to sched_ext/for-6.15.

Thanks.

-- 
tejun