linux-kernel - Re: stack overflow on Sparc64

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Message-Id: <20080620.142034.30884440.davem@davemloft.net>
Date:	Fri, 20 Jun 2008 14:20:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mpatocka@...hat.com
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	agk@...hat.com
Subject: Re: stack overflow on Sparc64

From: Mikulas Patocka <mpatocka@...hat.com>
Date: Fri, 20 Jun 2008 17:14:41 -0400 (EDT)

> Are you sure? What about this:
> ide-io.c:ide_intr
>          if (drive->unmask)
>                  local_irq_enable_in_hardirq();
> 
> or this:
> kernel/irq/handle.c:handle_IRQ_event
>          if (!(action->flags & IRQF_DISABLED))
>                  local_irq_enable_in_hardirq();
> 
> 
> --- how is number of nested interrupts here supposed to be limited?
> 
> If these things are not limited, you get at most as many nested handlers 
> as there are hardware interrupts, which means crash.

It means i386 and every other platform potentially has the same exact
problem.

What point wrt. sparc64 are you trying to make here? :-)


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