linux-kernel - Re: [Devel] Re: [PATCH] bluetooth bnep: Convert to kthread API.

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Message-ID: <462893F4.1000005@fr.ibm.com>
Date:	Fri, 20 Apr 2007 12:20:36 +0200
From:	Cedric Le Goater <clg@...ibm.com>
To:	devel@...nvz.org
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph@...p2.linux-foundation.org,
	Holtmann <marcel@...tmann.org>, linux-kernel@...r.kernel.org,
	Hellwig <hch@...radead.org>, containers@...ts.osdl.org,
	Marcel@...p2.linux-foundation.org, Oleg Nesterov <oleg@...sign.ru>
Subject: Re: [Devel] Re: [PATCH] bluetooth bnep: Convert to kthread API.

Andrew Morton wrote:
> On Thu, 19 Apr 2007 01:58:51 -0600
> "Eric W. Biederman" <ebiederm@...ssion.com> wrote:
> 
>> From: Eric W. Biederman <ebiederm@...ssion.com>
>>
>> This patch starts kbenpd using kthread_run replacing
>> a combination of kernel_thread and daemonize.  Making
>> the code a little simpler and more maintainable.
>>
>>
> 
> 	while (!atomic_read(&s->killed)) {
> 
> ho hum.


yes. we need something like :

-       while (!atomic_read(&s->killed)) {
+       while (1) {
                try_to_freeze();
 
                set_current_state(TASK_INTERRUPTIBLE);
 
+               if (atomic_read(&s->killed))
+                       break;
+

I have an old patch for this driver. I'll refresh it.

>> +	task = kthread_run(bnep_session, s, "kbnepd %s", dev->name);
> 
> It's unusual to have a kernel thread which has a space in its name.  That
> could trip up infufficient-defensive userspace tools.

but we can't just change it, can we ? i could be used by a user space tool 
to check if the thread is running.

C.
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