On Sat, Jul 25, 2015 at 8:57 AM, Andy Lutomirski <l...@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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
