Re: 2.4.18 Preempt Freezeups
Mike Fedyk (mfedyk@matchmail.com)
Fri, 15 Mar 2002 17:46:15 -0800
On Fri, Mar 15, 2002 at 05:40:36PM -0700, yodaiken@fsmlabs.com wrote:
> On Fri, Mar 15, 2002 at 02:11:49PM -0500, Robert Love wrote:
> > If you "poke the processor", to be SMP-safe, you should hold a lock to
> > prevent multiple concurrent "pokings of the processor" - thus you become
> > preempt-safe.
>
> Without preempt:
> x = movefrom processor register;
> do_something with x
>
> is safe in SMP
> With SMP it requires a lock.
>
"With preempt it requires a lock" you mean?
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