Re: [PATCH] Prevent nested interrupts when the IRQ stack is nearoverflowing v2

From: Peter Zijlstra
Date: Thu Mar 25 2010 - 14:24:09 EST


On Thu, 2010-03-25 at 19:21 +0100, Peter Zijlstra wrote:
> On Thu, 2010-03-25 at 11:01 -0700, Linus Torvalds wrote:
> > Are there any cases around
> > that still have busy-loop delays based on real-time in their irq handlers?
> > I simply don't know.
>
> I recently found a few in drivers/net/ there's all kinds of funny stuff
> in there.. not sure how common the matching hardware is though.
>
> One thing we could do is instrument jiffies to yell when its used from
> hardirq context and fix up these things.

Also, Arjan mentioned he wanted to sweep the kernel for jiffies users
and convert them to timer interfaces..

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