From: Andrew Morton <akpm@osdl.org>
To: Joe Korty <joe.korty@ccur.com>
Cc: rml@ximian.com, wli@holomorphy.com, albert@users.sourceforge.net,
linux-kernel@vger.kernel.org
Subject: Re: atomic copy_from_user?
Date: Mon, 22 Dec 2003 14:24:26 -0800 [thread overview]
Message-ID: <20031222142426.24c8951e.akpm@osdl.org> (raw)
In-Reply-To: <20031222215933.GA3189@rudolph.ccur.com>
Joe Korty <joe.korty@ccur.com> wrote:
>
> > 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.
>
> Hi Robert,
> I do not see why a non-preempt kernel would care at all about
> the value of preempt_count. (kmap_atomic is obviously setting it,
> where is the place in a non-preempt kernel where the set value
> is being acted upon?).
do_page_fault()'s in_atomic() test.
next prev parent reply other threads:[~2003-12-22 22:23 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
2003-12-22 21:59 ` Joe Korty
2003-12-22 22:14 ` Rob Love
2003-12-22 22:24 ` Andrew Morton [this message]
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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