Re: [PATCH] Add irqdevice interface + userint implementation

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

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.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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