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

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Message-ID: <20100325182702.GR20695@one.firstfloor.org>
Date:	Thu, 25 Mar 2010 19:27:02 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>, jesse.brandeburg@...el.com
Subject: Re: [PATCH] Prevent nested interrupts when the IRQ stack is near overflowing v2

> I think the patch as posted solves a real problem, but also perpetuates a bad 
> situation.
> 
> At minimum we should print a (one-time) warning that some badness occured. 
> That would push us either in the direction of improving drivers, or towards 
> improving the generic code.

What should a driver do to prevent that? I don't see what it could do
short of castrating itself (like refusing to use multiple ports)
As Linus says the driver doesn't know if setting IRQF_DISABLED is safe.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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