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

Peter Zijlstra
2010-03-25T18:24:06Z

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..