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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: VolanoMark regression with 2.6.27-rc1
Date: Thu, 21 Aug 2008 03:55:54 +1000
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Cc: Ray Lee <ray-lk@madrabbit.org>, adobriyan@gmail.com,
       Ingo Molnar <mingo@elte.hu>,
       "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
       Dhaval Giani <dhaval@linux.vnet.ibm.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
       Aneesh Kumar KV <aneesh.kumar@linux.vnet.ibm.com>,
       Balbir Singh <balbir@in.ibm.com>, Chris Friesen <cfriesen@nortel.com>
References: <1912217169.25608.228.camel@ymzhang> <2c0942db0808200929r640b3a1cj33efc56cfd6db9b3@mail.gmail.com> <1219252901.8651.63.camel@twins>
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On Thursday 21 August 2008 03:21, Peter Zijlstra wrote:
> Ok, so one last time (I hope!)..
>
> Everybody happy with this?


> Index: linux-2.6/include/linux/kernel.h
> ===================================================================
> --- linux-2.6.orig/include/linux/kernel.h
> +++ linux-2.6/include/linux/kernel.h
> @@ -367,6 +367,12 @@ static inline char *pack_hex_byte(char *
>  	(void) (&_max1 == &_max2);		\
>  	_max1 > _max2 ? _max1 : _max2; })
>
> +#define avg(x, y) ({				\
> +	typeof(x) _avg1 = (x);			\
> +	typeof(y) _avg2 = (y);			\
> +	(void) (&_avg1 == &_avg2);		\
> +	_avg1 + (_avg2 - _avg1)/2; })

That's not going to work with unsigned types.
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