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

From: Linus Torvalds
Date: Wed Nov 23 2005 - 18:29:49 EST

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

#define __smp_only__
#define __smp_only \
__attribute__((__unused__, section("discard")))

(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

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