Re: [PATCH] Add irqdevice interface + userint implementation

[Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>]

On Sun, Apr 08, 2007 at 01:23:15PM +0300, Avi Kivity wrote:
> Christoph Hellwig wrote:
> >>+/*----------------------------------------------------------------------
> >>+ * optimized bitarray object - works like bitarrays in bitops, but uses 
> >>+ * a summary field to accelerate lookups.  Assumes external locking 
> >>+ *---------------------------------------------------------------------*/
> >>+
> >>+struct bitarray {
> >>+	unsigned long summary; /* 1 per word in pending */
> >>+	unsigned long pending[NR_IRQ_WORDS];
> >>+};
> >>+
> >>    
> >This should go into a separate header, probably even in include/linux/
> >  
> 
> It's limited to BITS_PER_LONG * BITS_PER_LONG bits (1K or 4K, depending 
> on arch).  Do you see any potential users?
> 
> Making it generic would be difficult in C without preprocessor abuse.

True, scrap that comment.

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