Messages in this thread | | | Date | Wed, 14 Jul 2010 12:02:38 -0700 (PDT) | Subject | Re: [tip:x86/irq] x86: Always use irq stacks | From | David Miller <> |
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From: Thomas Gleixner <tglx@linutronix.de> Date: Wed, 14 Jul 2010 17:27:01 +0200 (CEST)
> On Wed, 14 Jul 2010, Christoph Hellwig wrote: > >> Turns out this wasn't a regression introduced by a commit, but it >> happens when CONFIG_FUNCTION_GRAPH_TRACER is enabled. From a quick >> look I have no idea why these would interact badly, especially as >> CONFIG_FUNCTION_GRAPH_TRACER works fine with irq stacks if the >> CONFIG_4KSTACKS options is set. > > So you're saying, that the problem appears when > CONFIG_FUNCTION_GRAPH_TRACER is enabled w/o being used and that it > exists prior to your patches with irq stacks and 8k stack size, but > works with 4k stacks. That's definitely more than odd.
Some hard-coded check somewhere assuming kernel stack pages won't straddle a page boundary?
Just a guess...
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