linux-kernel - Re: mmotm 2009-04-24-18-14 uploaded

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Date:	Wed, 29 Apr 2009 09:03:16 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Valdis.Kletnieks@...edu
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, mm-commits@...r.kernel.org
Subject: Re: mmotm 2009-04-24-18-14 uploaded - NVidia indigestion

On Tue, Apr 28, 2009 at 12:01:21PM -0400, Valdis.Kletnieks@...edu wrote:
> On Tue, 28 Apr 2009 08:15:57 +0200, Nick Piggin said:
> 
> Here's the code (pretty much *all* the code):
> 
> > #include <linux/version.h>
> > #include <linux/utsname.h>
> > int main() {
> > 	if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)) {
> > 		return 0;
> > 	} else {
> > 		return 1;
> > 	}
> > }
> 
> > Hmm, yes if you build without -O, then it appears like the compiler
> > trips over this. I wouldn't be unhappy with just removing the BUILD_BUG_ON,
> > but shouldn't the module be using -O[s2]?
> 
> It's a little autoconfig chunk from vendor code that determines if we're
> building on a sane/recent kernel.  Not the sort of thing you'd expect to
> need to invoke the frikking optimizer for program *correctness* :)

The kernel I think has for a long time required -O to compile correctly
because some things marked inline have had to be inlined for correctness.
This might have changed now that we have __always_inline, but anyway.

But I'll just get rid of that BUILD_BUG_ON.

Thanks,
Nick
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