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

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From: Linus Torvalds
Subject: Re: [PATCH] Prevent nested interrupts when the IRQ stack is near overflowing v2
Date: Thursday, March 25, 2010 - 11:01 am

On Thu, 25 Mar 2010, Peter Zijlstra wrote:

The thing is, that won't show the drivers that just simply _expect_ 
other interrupts to happen.

The SCSI situation, iirc, used to be that certain error conditions simply 
caused a delay loop (reset? I forget) that depended on 'jiffies'. So there 
was no 'local_irq_enable()' involved, nor did it even happen under any 
normal load - only in error situations.

Now, I think (and sincerely) that the SCSI situation is likely long since 
fixed, but we have thousands and thousands of drivers, and these kinds of 
things are very hard to notice automatically. Are there any cases around 
that still have busy-loop delays based on real-time in their irq handlers? 
I simply don't know.

			Linus
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Messages in current thread:
[PATCH] Prevent nested interrupts when the IRQ stack is ne ..., Andi Kleen, (Wed Mar 24, 12:02 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Thomas Gleixner, (Wed Mar 24, 1:42 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Thomas Gleixner, (Wed Mar 24, 4:08 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Wed Mar 24, 5:36 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Thomas Gleixner, (Wed Mar 24, 6:46 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Thu Mar 25, 2:37 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Alan Cox, (Thu Mar 25, 3:50 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Thomas Gleixner, (Thu Mar 25, 4:09 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Thomas Gleixner, (Thu Mar 25, 4:16 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Thu Mar 25, 4:57 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Alan Cox, (Thu Mar 25, 4:59 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Thu Mar 25, 5:00 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Thu Mar 25, 5:11 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Thomas Gleixner, (Thu Mar 25, 6:17 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Thu Mar 25, 6:32 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Thomas Gleixner, (Thu Mar 25, 7:16 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Thu Mar 25, 8:38 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Alan Cox, (Thu Mar 25, 9:06 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Linus Torvalds, (Thu Mar 25, 9:13 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Linus Torvalds, (Thu Mar 25, 9:17 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Ingo Molnar, (Thu Mar 25, 9:27 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Ingo Molnar, (Thu Mar 25, 9:33 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Thomas Gleixner, (Thu Mar 25, 9:52 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Peter Zijlstra, (Thu Mar 25, 10:47 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Linus Torvalds, (Thu Mar 25, 11:01 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Peter Zijlstra, (Thu Mar 25, 11:21 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Peter Zijlstra, (Thu Mar 25, 11:23 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Thu Mar 25, 11:27 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Ingo Molnar, (Thu Mar 25, 11:29 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Thu Mar 25, 11:44 am)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Ingo Molnar, (Thu Mar 25, 12:01 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Linus Torvalds, (Thu Mar 25, 12:10 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., David Miller, (Thu Mar 25, 12:42 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Linus Torvalds, (Thu Mar 25, 1:40 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Ingo Molnar, (Thu Mar 25, 1:51 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Linus Torvalds, (Thu Mar 25, 1:53 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., David Miller, (Thu Mar 25, 8:33 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Eric W. Biederman, (Thu Mar 25, 9:55 pm)
Re: [PATCH] Prevent nested interrupts when the IRQ stack i ..., Andi Kleen, (Thu Mar 25, 11:10 pm)