From: Frank Rowand <frank.rowand@am.sony.com>
To: Jacky Lam <lamshuyin@gmail.com>
Cc: Stanislav Meduna <stano@meduna.org>,
"linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>
Subject: Re: Protection of critical section in PREEMPT_RT
Date: Thu, 31 Jan 2013 11:52:39 -0800 [thread overview]
Message-ID: <510ACB87.3080007@am.sony.com> (raw)
In-Reply-To: <CAHX1yNTKw8vr2v01Eft1tVV5YrP-7Zw=3fk9iF6YJYfbnBJ9LQ@mail.gmail.com>
On 01/31/13 01:27, Jacky Lam wrote:
> Thanks Stano,
>
> I am still debugging this driver. But I find very strange that
> sometimes printk() in interrupt handler do not output anything. This
> makes me very difficult to debug. Is it RT patch's expected behaviour?
> Or I am doing something wrong??
If CONFIG_PREEMPT_RT_FULL then printk() from irq context will be buffered
but the console driver will not be called to flush the buffer. The
next printk() outside irq context will flush the buffer.
-Frank
next prev parent reply other threads:[~2013-01-31 19:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-22 3:29 Protection of critical section in PREEMPT_RT Jacky Lam
2013-01-22 10:24 ` Stanislav Meduna
2013-01-31 9:27 ` Jacky Lam
2013-01-31 19:52 ` Frank Rowand [this message]
2013-02-04 7:27 ` Jacky Lam
2013-02-04 10:40 ` Thomas Gleixner
2013-02-05 1:40 ` Jacky Lam
2013-02-05 10:05 ` Thomas Gleixner
2013-02-06 1:59 ` Jacky Lam
2013-02-06 8:56 ` Stanislav Meduna
2013-02-13 11:31 ` Thomas Gleixner
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