Re: [NET]: Shut up warnings in net/core/flow.c

[Linus Torvalds <torvalds@osdl.org>]

On Wed, 23 Nov 2005, David S. Miller wrote:
> 
> 1) Mark all IPI functions with ifdef CONFIG_SMP, or
> 2) Mark them with __attribute__((__unused__))) which is what
>    the net/core/flow.c case does

We could certainly do some of both.

Add a new "__smp_only__" thing, and do something like

	#ifdef CONFIG_SMP
	  #define __smp_only__
	#else
	  #define __smp_only \
		__attribute__((__unused__, section("discard")))
	#endif

(Yeah, I didn't look up the section syntax, because I'm lazy, but you get 
the point - put it explicitly in some section that will be thrown away, 
and that we can make the build-checking tools verify isn't linked to).

How does that feel? It would waste a bit of compiler time to even look at 
the function, but at least it wouldn't warn, and they'd get thrown away 
_without_ having to rely on a smart compiler.

Quite frankly, every time we rely on some really smart gcc feature, we're 
burnt.

		Linus
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