Messages in this thread | | | Date | Mon, 17 Aug 2015 14:18:27 +0300 | Subject | Re: [PATCH v2 1/3] x86/entry/64: Refactor IRQ stacks and make them NMI-safe | From | Andy Shevchenko <> |
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On Sat, Jul 25, 2015 at 8:57 AM, Andy Lutomirski <luto@kernel.org> wrote: > This will allow IRQ stacks to nest inside NMIs or similar entries > that can happen during IRQ stack setup or teardown. > > The Xen code here has a confusing comment. > > The new macros won't work correctly if they're invoked with IRQs on. > Add a check under CONFIG_DEBUG_ENTRY to detect that. >
> +/* > + * Enters the IRQ stack if we're not already using it. NMI-safe. Clobbers > + * flags and puts old RSP into old_rsp, and leaves all other GPRs alone. > + * Requires kernel GSBASE. > + * > + * The invariant is that, if irq_count != 1, then the IRQ stack is in use. > + */
I might be wrong, but shouldn't be this read as 'if irq_count != -1' ?
-- With Best Regards, Andy Shevchenko
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