From: Rob Love <rml@ximian.com>
To: Joe Korty <joe.korty@ccur.com>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Albert Cahalan <albert@users.sourceforge.net>,
linux-kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: atomic copy_from_user?
Date: Mon, 22 Dec 2003 16:40:11 -0500 [thread overview]
Message-ID: <1072129210.3318.34.camel@fur> (raw)
In-Reply-To: <20031222212237.GA2865@rudolph.ccur.com>
On Mon, 2003-12-22 at 16:22, Joe Korty wrote:
> I am guessing that nowdays even when preemption is disabled one can
> find preempt_count still being used somewhere. Otherwise it would be
> better to replace all uses of inc_preempt_count() with
> preempt_disable() and dec_preempt_count() with preempt_enable().
Right. So why did you make this patch? :)
inc_preempt_count() and dec_preempt_count() are for use when you
_absolutely_ must manage the preemption counter, regardless of whether
or not kernel preemption is enabled.
They are used for things like atomic kmaps.
Rob Love
next prev parent reply other threads:[~2003-12-22 21:40 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-22 0:48 atomic copy_from_user? Albert Cahalan
2003-12-22 4:31 ` Linus Torvalds
2003-12-22 9:36 ` Andrew Morton
2003-12-22 15:00 ` William Lee Irwin III
2003-12-22 18:26 ` Joe Korty
2003-12-22 20:55 ` Rob Love
2003-12-22 21:22 ` Joe Korty
2003-12-22 21:40 ` Rob Love [this message]
2003-12-22 21:59 ` Joe Korty
2003-12-22 22:14 ` Rob Love
2003-12-22 22:24 ` Andrew Morton
2003-12-22 22:06 ` Joe Korty
2003-12-22 22:18 ` Rob Love
2003-12-22 22:14 ` Andrew Morton
2003-12-22 22:19 ` Rob Love
2003-12-22 22:35 ` Joe Korty
2003-12-22 22:59 ` Rob Love
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