From: Robert Love <rml@tech9.net>
To: Emmanuel Michon <emmanuel_michon@realmagic.fr>
Cc: linux-kernel@vger.kernel.org
Subject: Re: spinlocking between user context / tasklet / tophalf question
Date: 26 Apr 2002 15:19:35 -0400 [thread overview]
Message-ID: <1019848780.2045.617.camel@phantasy> (raw)
In-Reply-To: <7wwuuu4zam.fsf@avalon.france.sdesigns.com>
On Fri, 2002-04-26 at 04:52, Emmanuel Michon wrote:
> 1. Should I use spin_lock(&Y_lock); or spin_lock_bh(&Y_lock); in the tasklet
> body?
You would want to use spin_lock_bh to serialize against other softirqs.
That does not seem to be a need, here.
> 2. What is the reality behind: ``things which sleep'', is it really a problem
> to use copy_from_user/copy_to_user holding a spinlock?
Yes, they sleep.
Robert Love
next prev parent reply other threads:[~2002-04-26 19:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-26 8:52 spinlocking between user context / tasklet / tophalf question Emmanuel Michon
2002-04-26 16:33 ` george anzinger
2002-04-27 19:13 ` Alan Cox
2002-04-26 19:19 ` Robert Love [this message]
2002-04-27 22:52 ` Daniel Phillips
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