linux-kernel - Re: Thread flags modified without set_thread

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Message-ID: <20070301111447.37ae08f5@dhcp-252-105.norway.atmel.com>
Date:	Thu, 1 Mar 2007 11:14:47 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mathieu Desnoyers <compudj@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Thread flags modified without set_thread_flag() (non
 atomically)

On Thu, 1 Mar 2007 01:45:23 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> If there's a lesson here, it is "don't provide #defines in the header for
> both versions".

Yes, that's true. It looks like all the other arches do the same thing
with the _TIF flags, however, so just ripping it out probably won't
work. Maybe I'll give it a try just to see how much trouble it is.

> > I don't think either of those need to be atomic though, since both of
> > them happen in monitor mode with interrupts disabled.
> 
> That's true until you implement SMP ;)

True. I'm not sure what it can race against though...perhaps something
in kernel/signal.c?

Haavard
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