Re: [Suggestion] arch: s390: mm: the warnings with allmodconfig and"EXTRA_CFLAGS=-W"

[Chen Gang]

On 06/25/2013 02:50 PM, Martin Schwidefsky wrote:
> On Tue, 25 Jun 2013 09:54:41 +0800
> Chen Gang <gang.chen@xxxxxxxxxxx> wrote:
> 
>> > Hello Maintainers:
>> > 
>> > When allmodconfig for " IBM zSeries model z800 and z900"
>> > 
>> > It will report the related warnings ("EXTRA_CFLAGS=-W"):
>> >   mm/slub.c:1875:1: warning: âdeactivate_slabâ uses dynamic stack allocation [enabled by default]
>> >   mm/slub.c:1941:1: warning: âunfreeze_partials.isra.32â uses dynamic stack allocation [enabled by default]
>> >   mm/slub.c:2575:1: warning: â__slab_freeâ uses dynamic stack allocation [enabled by default]
>> >   mm/slub.c:1582:1: warning: âget_partial_node.isra.34â uses dynamic stack allocation [enabled by default]
>> >   mm/slub.c:2311:1: warning: â__slab_alloc.constprop.42â uses dynamic stack allocation [enabled by default]
>> > 
>> > Is it OK ?
> Yes, these warnings should be ok. They are enabled by CONFIG_WARN_DYNAMIC_STACK,
> the purpose is to find all functions with dynamic stack allocations. The check
> if the allocations are truly ok needs to be done manually as the compiler
> can not find out the maximum allocation size automatically.

Thank you very much for your details information.

-- 
Chen Gang

Asianux Corporation
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