From nobody Fri Apr 3 02:56:37 2026 Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D081E17BA2 for ; Wed, 25 Mar 2026 03:11:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774408307; cv=none; b=AgBPBGPHoOgriXM1L1pn0OqRj5nHfcx3UJgaHu6/IR+zBGTSCcbNTaQEI7twsoOeKd7VxaYOazPD/JUTzdzDW7TcNA19rD6YRl2TYwY5lrXsBiLSglxN9ofLzbCaaRC8xnG4VRjrpfim2Vq2W7160R/B9oGpMCifhf4+rFFAUjI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774408307; c=relaxed/simple; bh=WZplLBb/zzJ8TopyIP/QMhDwLUpLW5NNVl6kzErBwKg=; h=From:To:Cc:Subject:Date:Message-Id; b=Vv1YhCSzZ2W2CPP6K0CNUMVh7+e1vYZN88u7UQ6iyqGNcYd8KoCH3yImM//m7vQsY+5xR94PsJuEhHx+3ka2OP+lNjEVjsX57Spd7MU2KytevukG4756d4HZO02gw3MBwPYtNoF9mnd6QYkjnT60AcCkM4deNzJF90JHOvRS7PE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=O/J8gzJ9; arc=none smtp.client-ip=95.215.58.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="O/J8gzJ9" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1774408304; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc; bh=GlOjr1EZKY3bXhZ6vt9D9keuTZu2IvV3+IrU6oq6YrY=; b=O/J8gzJ9jnEUUIa42YQw5qPNNZwgIN3zkQbyJiFoe7xh1rg6aLK40/RT4D8spV3fq6b1I2 TrfT3aBZBrhqUpqOMHwdgZ+n4er4piQk8tJ/h4/+0VlEOdelGNXRJv6P96ID1SGH7kKFfd WrPURDoiwELRuwDuvSD9nnt1u1+ojo0= From: Zqiang To: tj@kernel.org, void@manifault.com, arighi@nvidia.com, changwoo@igalia.com Cc: sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org, qiang.zhang@linux.dev Subject: [PATCH v2] sched_ext: Choose the right sch->ops.name to output in the print_scx_info() Date: Wed, 25 Mar 2026 11:11:00 +0800 Message-Id: <20260325031100.22840-1-qiang.zhang@linux.dev> X-Migadu-Flow: FLOW_OUT Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The print_scx_info() always output scx_root structure's->ops.name, but for built with CONFIG_EXT_SUB_SCHED=3Dy kernels, the tasks may be attach an sub scx_sched structure. this commit therefore use the scx_task_sched_rcu() to correctly get scx_sched structure to output ops.name, and drop state check. Suggested-by: Tejun Heo Signed-off-by: Zqiang --- kernel/sched/ext.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 2472231ec556..551bfb99157d 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -7680,14 +7680,18 @@ static void kick_cpus_irq_workfn(struct irq_work *i= rq_work) */ void print_scx_info(const char *log_lvl, struct task_struct *p) { - struct scx_sched *sch =3D scx_root; + struct scx_sched *sch; enum scx_enable_state state =3D scx_enable_state(); const char *all =3D READ_ONCE(scx_switching_all) ? "+all" : ""; char runnable_at_buf[22] =3D "?"; struct sched_class *class; unsigned long runnable_at; =20 - if (state =3D=3D SCX_DISABLED) + guard(rcu)(); + + sch =3D scx_task_sched_rcu(p); + + if (!sch) return; =20 /* --=20 2.17.1