[PATCH] Quieten arch/powerpc in a allmodconfig build.

[Segher Boessenkool]

>> /scratch/tony/working/arch/powerpc/kernel/cacheinfo.c: In function  
>> 'associativity_show':
>> /scratch/tony/working/arch/powerpc/kernel/cacheinfo.c:562:  
>> warning: 'associativity' may be used uninitialized in this function
>> /scratch/tony/working/arch/powerpc/kernel/cacheinfo.c: In function  
>> 'size_show':
>> /scratch/tony/working/arch/powerpc/kernel/cacheinfo.c:513:  
>> warning: 'size_kb' may be used uninitialized in this function
>
> Thanks.
>
> So I think I've convinced myself that the warnings are incorrect and
> that uninitialized use is not possible.

Strictly speaking the warnings aren't incorrect: the variables
"may be used uninitialized", they just never are.  I agree this
isn't very helpful.

> But I find it odd that gcc gives warnings for these sites but not  
> others
> in the file that use the same idiom (e.g. line_size_show,
> nr_sets_show).

Yeah.

> I'd guess that inlining is implicated somehow.  Would I
> be justified in worrying that this version of gcc is generating
> incorrect code?

Not really.  Sub-optimal code perhaps, but not incorrect.

> If not, then I'm fine with the uninitialized_var() changes, but do
> please include the warnings and the compiler version in the changelog.

If this happens with a non-ancient GCC version, can we have a bugreport
please?


Segher