Re: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U8

[hui]

On Thu, Oct 21, 2004 at 12:11:03PM +0200, Jens Axboe wrote:
> I didn't look at the USB code, I'm just saying that it's perfectly valid
> use of a semaphore the pattern you describe (process A holding it,
> process B releasing it).

A lot of things are perfectly "valid" in the Linux kernel regarding
stuff like that are a bit irregular. But the preemption work about
to stress these things in ways that was never designed to which is
why these patches are needed. Having a clear use of various locking
conventions is key to getting this system to behave in a predictable
manner. Quite simply, Linux was never targetted to do this and the
sloppiness is showing so it's got to be removed.

bill

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