linux-kernel - Re: linux-next: build failure

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Message-ID: <20080729114029.GA3836@elte.hu>
Date:	Tue, 29 Jul 2008 13:40:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	David Miller <davem@...emloft.net>, linux-next@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus <torvalds@...ux-foundation.org>,
	Mike Travis <travis@....com>
Subject: Re: linux-next: build failure


* KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > 
> > * Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > 
> > > Hi Ingo,
> > > 
> > > On Tue, 29 Jul 2008 10:00:55 +0200 Ingo Molnar <mingo@...e.hu> wrote:
> > > >
> > > > > -#define cpumask_of_cpu(cpu) ({ *get_cpu_mask(cpu); })
> > > > > +#define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
> > > > 
> > > > hm, i'm wondering - is this a compiler bug?
> > > 
> > > Or maybe a deficiency in such an old compiler (v3.4.5) but the fix 
> > > makes sense anyway, right?
> > 
> > yeah, i was just wondering.
> 
> in linux/README
> 
> COMPILING the kernel:
> 
>  - Make sure you have at least gcc 3.2 available.
>    For more information, refer to Documentation/Changes.
> 
> So, if 3.4.5 is old, Should we change readme?

the fix is simple enough.

but the question is, wont it generate huge artificial stackframes with 
CONFIG_MAXSMP and NR_CPUS=4096? Maybe it is unable to figure out and 
simplify the arithmetics there - or something like that.

	Ingo
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