linux-kernel - Re: [git pull] cpus4096 fixes

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Message-ID: <20080728185134.GA11664@elte.hu>
Date:	Mon, 28 Jul 2008 20:51:34 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Mike Travis <travis@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [git pull] cpus4096 fixes


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Mon, 28 Jul 2008, Linus Torvalds wrote:
> > 
> > Here's a trivial setup, that is even tested. It's _small_ too.
> > 
> > 	/* cpu_bit_bitmap[0] is empty - so we can back into it */
> > 	#define MASK_DECLARE_1(x) [x+1][0] = 1ul << (x)
> > 	#define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1)
> > 	#define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2)
> > 	#define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4)
> > 
> > 	static const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = {
> > 		MASK_DECLARE_8(0), MASK_DECLARE_8(8),
> > 		MASK_DECLARE_8(16), MASK_DECLARE_8(24),
> > 	#if BITS_PER_LONG > 32
> > 		MASK_DECLARE_8(32), MASK_DECLARE_8(40),
> > 		MASK_DECLARE_8(48), MASK_DECLARE_8(56),
> > 	#endif
> > 	};
> > 
> > 	static inline const cpumask_t *get_cpu_mask(unsigned int nr)
> > 	{
> > 		const unsigned long *p = cpu_bit_bitmap[1 + nr % BITS_PER_LONG];
> > 		p -= nr / BITS_PER_LONG;
> > 		return (const cpumask_t *)p;
> > 	}
> 
> Btw, Ingo, can we get this issue resolved asap, please?
> 
> I was planning on doing -rc1 today, but this kind of hangs over me. 
> The above three lines of code (and more lines of macro initializers) 
> obviously does need some more testing, but if you hook it into the 
> other changes you already had, maybe we can get it done.
> 
> Hmm?

yeah, i'm on it. If everything goes well hopefully i'll have something 
pullable in 1-2 hours, if that's ok as a timeframe.

	Ingo
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