linux-kernel - Re: [PATCH 5.10-rt] printk: ignore that console preempted by irq/softirq

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Date: Mon, 03 Jun 2024 22:17:35 +0206
From: John Ogness <john.ogness@...utronix.de>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>, xu xin
 <xu.xin.sc@...il.com>
Cc: xu.xin16@....com.cn, linux-kernel@...r.kernel.org,
 linux-rt-users@...r.kernel.org, liu.chun2@....com.cn, rostedt@...dmis.org,
 si.hao@....com.cn, yang.yang29@....com.cn, zhang.yunkai@....com.cn
Subject: Re: [PATCH  5.10-rt] printk: ignore that console preempted by
 irq/softirq

On 2024-05-28, Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> There is a `may_sleep` variable set earlier. Couldn't that be re-used?

Since the printing thread cannot preempt the softirq context and since
the printing threads are not started before @system_state is
SYSTEM_RUNNING, using @may_sleep is OK.

if (!may_sleep &&
    con->thread &&
    task_cpu(con->thread) == smp_processor_id()) {
	continue;
}

John Ogness