From: "Petr Vandrovec" <VANDROVE@vc.cvut.cz>
To: Andrew Morton <andrewm@uow.edu.au>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
FrameBuffer List <linux-fbdev@vuser.vu.union.edu>,
Linux console project <linuxconsole-dev@lists.source.redhat.com>
Subject: Re: [linux-fbdev] Re: console spin_lock
Date: Wed, 17 Jan 2001 18:02:21 MET-1 [thread overview]
Message-ID: <12D9032A5156@vcnet.vc.cvut.cz> (raw)
On 18 Jan 01 at 0:49, Andrew Morton wrote:
> Assumption:
> - Once the system is up and running, it's always safe to
> call down() when in_interrupt() returns false - probably
> not the case in parts of the exit path - tough.
>
> Anyway, that's the thoughtware. Sound sane?
Do not forget to handle printk() done by fbdev driver... It
may invoke printk() from user context, but with console_semaphore
already held... Something like reentrant_semaphore? Also, we
should declare which console/fbdev function can printk/can schedule
and which must not, as using interrupts & schedule could yield
CPU to other tasks when (hardware assisted) operation is performed.
Some of them (clear, bmove) can take loong time to finish.
Best regards,
Petr Vandrovec
vandrove@vc.cvut.cz
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reply other threads:[~2001-01-17 17:04 UTC|newest]
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