Re: [PATCH][RFC] getting rid of stupid loop in BUG()

From: Al Viro
Date: Wed Jul 25 2007 - 13:27:29 EST


On Wed, Jul 25, 2007 at 10:22:15AM -0700, H. Peter Anvin wrote:
> >> So we might as well keep the loop, since both are two-byte instructions
> >> that tell gcc that it will never continue.
> >
> > Umm... Actually, we might be able to do something like
> > {
> > l: __builtin_trap();
> > static struct ... v __attribute__((section(...))) = { &&l, n, file };
> > }
> >
> > except that it would need block-local labels and those are ugly (so's
> > &&<label>, while we are at it)...
>
> I thought gcc was buggy when it came to passing &&labels to assembly.

Where do you see passing &&<label> to assembly? More interesting question
is whether gcc believes it to be const...
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