[Xen-devel] Re: [PATCH] Modpost section mismatch fix

[Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>]

* On Mon, Jul 04, 2011 at 09:49:48AM +0100, Ian Campbell <ijc@xxxxxxxxxxxxxx> 
wrote:
> On Mon, 2011-07-04 at 04:55 +0530, Raghavendra D Prabhu wrote:
> > [Sorry if duplicate, one earlier was corrupt]
> > Hi,
> >      I got section mismatches reported by modpost in latest build. It got
> >      reported for xen_register_pirq and xen_unplug_emulated_devices
> >      functions.
> >  xen_register_pirq makes reference to
> >      acpi_sci_override_gsi in init.data section; marking
> >      xen_register_pirq with __init is not feasible since calls are made
> >      to it from acpi_register_gsi in non-init contexts. So marking it
> >      __refdata based on assumption that when acpi_sci_override_gsi is
> >      referenced, it is in  early stages where it is alive.
> I don't think this assumption holds, since xen_register_pirq can be
> called at any time and basically unconditionally references
> acpi_sci_override_gsi.
Yeah, that has been my guess as well, however I am not privy to the
inner workings of Xen, so was not sure.
> If we don't want to remove the __init from acpi_sci_override_gsi then
> perhaps xen_setup_acpi_sci needs to stash it somewhere?
>
> Or maybe xen_register_pirq could take an "int force_irq" which, if not
> -1, would force a particular IRQ. The callsite in xen_setup_acpi_sci
> (actually via xen_register_gsi so the param would need to be propagated
> there) would be the only actual user?
xen_register_gsi and hence, xen_register_pirq are called from
init (with xen_setup_acpi_sci) and non-init (with
acpi_register_gsi_xen); since xen_set_acpi_sci calls it with gsi ==
acpi_sci_override_gsi and is marked __init, the best way would be to
call xen_register_gsi and xen_register_pirq with a boolean argument like
sci_override to obviate the need to use acpi_sci_override_gsi in
register_pirq. I will send the patch with this change if it looks good.


> The xen_unplug_emulated_devices change looks correct to me since
> xen_unplug_emulated_devices is called from xen_arch_hvm_post_suspend.
>
> Ian.
> > --------------------------
> > Raghavendra Prabhu
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