Message-ID: <41D84503.2040808@cwazy.co.uk>
Date: Sun, 02 Jan 2005 14:01:23 -0500
From: Jim Nelson <james4765@cwazy.co.uk>
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040922
MIME-Version: 1.0
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
CC: Coywolf Qi Hunt <coywolf@gmail.com>, Jesper Juhl <juhl-lkml@dif.dk>,
       David Howells <dhowells@redhat.com>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: printk loglevel policy?
References: <Pine.LNX.4.61.0412310259230.4725@dragon.hygekrogen.localhost>	 <2cd57c9004123018203b7e38ef@mail.gmail.com> <1104675855.15004.56.camel@localhost.localdomain>
In-Reply-To: <1104675855.15004.56.camel@localhost.localdomain>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1160
Lines: 34

Alan Cox wrote:
> On Gwe, 2004-12-31 at 02:20, Coywolf Qi Hunt wrote:
> 
>>Hi all, 
>>
>>Recently, I've seen a lot of add loglevel to printk patches. 
>>grep 'printk("' -r | wc shows me 2433. There are probably 2433 printk
>>need to patch, is it?  What's this printk loglevel policy, all these
> 
> 
> You would need to work out which were at the start of a newline - most
> of them are probably just fine and valid
> 

That reminds me of a question I've had inthe back of my head.  When you have a SMP 
system wouldn't it be possible to have:

CPU 1 (running func1)	CPU 2 (running func2)
  |			 |
  printk ("foo...");	 |
  |			printk ("bleh\n");
  printk ("finished\n);	 |
			printk ("readout from bleh\n";

Is that possible?  Especially if the process on CPU 1 slept on a semaphore or 
something similar?

Or does printk() do some tracking that I didn't see as to where in the kernel the 
strings are coming from?
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/