Re: [PATCH] Relay CPU Hotplug support

[Andrew Morton]

On Fri, 22 Dec 2006 16:07:24 +0530
Gautham R Shenoy <ego@xxxxxxxxxx> wrote:

> While we are at this per-subsystem cpuhotplug "locking", here's a
> proposal that might put an end to the workqueue deadlock woes.

Oleg is working on some patches which will permit us to cancel or wait upon
a particular work_struct, rather than upon all pending work_structs.  

This will fix the problem where we accidentlly wait upon some unrelated
work_struct which takes a lock which is related to one which we already
hold.

I hope.  It'll be a bit tricky to implement: if some foreign work_struct is
running right now, we cannot wait upon it - we must non-blockingly dequeue
the work_struct which we want to kill before it gets to run.


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