[PATCH] powerpc/msi: fix section mismatch warning

[Denis Kirjanov]

On 10/21/15, Arnd Bergmann <arnd at arndb.de> wrote:
> On Wednesday 21 October 2015 08:56:44 Denis Kirjanov wrote:
>> Building with CONFIG_DEBUG_SECTION_MISMATCH
>> gives the following warning:
>>
>> WARNING: vmlinux.o(.text+0x41fa8): Section mismatch in reference from
>> the function .msi_bitmap_alloc() to the function
>> .init.text:.memblock_virt_alloc_try_nid()
>> The function .msi_bitmap_alloc() references
>> the function __init .memblock_virt_alloc_try_nid().
>> This is often because .msi_bitmap_alloc lacks a __init
>> annotation or the annotation of .memblock_virt_alloc_try_nid is wrong.
>>
>> Signed-off-by: Denis Kirjanov <kda at linux-powerpc.org>
>>
>
> A patch like this usually requires an explanation why the warning is
> a false positive and why there is no way to solve it besides suppressing
> the warning.

Because memory allocation in msi_bitmap_alloc use either slab allocator or
memblock boot-time allocator so that's why we need the __init_refok
for the latter case. I'll add it to the patch description

>
> 	Arnd
>