linux-kernel - Re: make-bogus-warnings-go-away tree [was: 2.6.18-mm3]

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Date:	Thu, 5 Oct 2006 16:52:52 -0400
From:	Kyle Moffett <mrmacman_g4@....com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>
Subject: Re: make-bogus-warnings-go-away tree [was: 2.6.18-mm3]

On Oct 05, 2006, at 06:05:16, Jeff Garzik wrote:
> Ingo Molnar wrote:
>> A small suggestion: to give GCC folks a chance to actually fix  
>> this, could we actively annotate these places instead of working  
>> them around?
>
> There was a patch posted in the past, mentioned in the thread  
> discussed my #gccbug branch, that permitted annotations with zero  
> code size changes.  I think that sort of annotation approach would  
> be preferred. It was something like
>
> #define noinit_warning(x) \
> 	do { (void) (x) = (x); } while (0)
>
> but given my memory, that's probably all wrong.

The simplest way given the current GCC feature-set is:

   #ifdef HIDE_GCC_FALSE_POSITIVES
   # define correct_init(x) x = x
   #else
   # define correct_init(x) x
   #endif

Then:

   int correct_init(arg);
   struct some_struct correct_init(foo);

Alternatively if only some struct member has problems and the rest  
are OK:

   struct some_struct foo;
   correct_init(foo.bar);

Cheers,
Kyle Moffett

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