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SubjectRe: [tip:x86/urgent] x86: Fix false positive section mismatch warnings in the apic code
On 4/19/09, Sam Ravnborg <> wrote:
> If I understand it correct we have the following:

> (data) struct apic apic_es7000.acpi_madt_oem_check =>
> (function) es7000_acpi_madt_oem_check =>
> (function) find_unisys_acpi_oem_table
> (__init) early_acpi_os_unmap_memory
> So the real fix is to:
> 1) annotate find_unisys_acpi_oem_table __init
> 2) annotate es7000_acpi_madt_oem_check __init
> 3) teach modpost that struct apic apic_es7000 may reference __init
> Step 3 is done using __refdata
> Based on the above analysis I would assume the best fix
> would look like this the following.
> [I only looked at the first warning]
> Rabik/Marcin - if you agree in the analysis could you produce
> a proper patch and send to Ingo - thanks.
> You can add my:
> Signed-off-by: Sam Ravnborg <>
> if the patch is ok.
> Sam
Hi Sam, after applying your suggested three steps, we still have the
following warning:

WARNING: arch/x86/kernel/built-in.o(.text+0x36174): Section mismatch
in reference from the function unmap_unisys_acpi_oem_table() to the
function .init.text:__acpi_unmap_table()
The function unmap_unisys_acpi_oem_table() references
the function __init __acpi_unmap_table().
This is often because unmap_unisys_acpi_oem_table lacks a __init
annotation or the annotation of __acpi_unmap_table is wrong.

So, I think we've to annote unmap_unisys_acpi_oem_table with __init (
If we apply Sam's suggested steps). If anything else please notice.


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