Date: Wed, 21 Dec 2005 17:02:23 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Oleg Nesterov <oleg@tv-sign.ru>
Cc: linux-kernel@vger.kernel.org, Linus Torvalds <torvalds@osdl.org>,
       Andrew Morton <akpm@osdl.org>, Arjan van de Ven <arjanv@infradead.org>,
       Steven Rostedt <rostedt@goodmis.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Christoph Hellwig <hch@infradead.org>, Andi Kleen <ak@suse.de>,
       David Howells <dhowells@redhat.com>,
       Alexander Viro <viro@ftp.linux.org.uk>, Paul Jackson <pj@sgi.com>
Subject: Re: [patch 05/15] Generic Mutex Subsystem, mutex-core.patch
Message-ID: <20051221160223.GC7375@elte.hu>
References: <20051219013718.GA28038@elte.hu> <43A98101.364DB5CF@tv-sign.ru>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <43A98101.364DB5CF@tv-sign.ru>
User-Agent: Mutt/1.4.2.1i
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 993
Lines: 30


* Oleg Nesterov <oleg@tv-sign.ru> wrote:

> > +start_mutex_timer(struct timer_list *timer, unsigned long time,
> > +		  unsigned long *expire)
> > +{
> > +	*expire = time + jiffies;
> > +	init_timer(timer);
> > +	timer->expires = *expire;
> > +	timer->data = (unsigned long)current;
> > +	timer->function = process_timeout;
> > +	add_timer(timer);
> > +}
> 
> How about
> 	setup_timer(&timer, process_timeout, (unsigned long)current);
> 	__mod_timer(&timer, *expire);
> ?

i've removed the timer code from the latest queue - because it's unused 
and we can add it back later. But you are right, it was racy (Arjan 
noticed the signal race too), because this codepath in -rt relied on 
guaranteed lock-passing. (while mutex.c does a trylock)

	Ingo
-
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/