From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Richard J Moore <richardj_moore@uk.ibm.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Michael Grundy <vamsi_krishna@in.ibm.com>,
Mikael Pettersson <mikpe@csd.uu.se>,
suparna <bsuparna@in.ibm.com>,
vamsi@linux.ibm.com
Subject: Re: [rfc] [patch] kernel hooks
Date: 03 Oct 2002 15:00:52 +0100 [thread overview]
Message-ID: <1033653652.28022.20.camel@irongate.swansea.linux.org.uk> (raw)
In-Reply-To: <OFAC358F0A.6BBBEF7D-ON80256C47.004A301E@portsmouth.uk.ibm.com>
On Thu, 2002-10-03 at 14:32, Richard J Moore wrote:
>
> > You must also ensure that the code you are modifying isnt on an IRQ path
> > (if it is you must do spin locks and then be very careful about cross
> > cpu tlb deadlocks). Finally you have no choice but to ensure you never
> > use it on the NMI path
>
> Why do we need a spinlock? We change one byte, we are not concered about
> when exactly that takes effect, only that there are always valid
> instructions in the pipeline.
Because you are programming for real silicon not for the imaginary
perfect processor. Read the x86 errata
next prev parent reply other threads:[~2002-10-03 13:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-03 13:32 Richard J Moore
2002-10-03 14:00 ` Alan Cox [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-10-04 9:23 Richard J Moore
2002-10-03 12:26 Vamsi Krishna S .
2002-10-03 12:40 ` Mikael Pettersson
2002-10-03 13:01 ` Alan Cox
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