linux-kernel - Re: VolanoMark regression with 2.6.27-rc1

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Message-Id: <200808210355.55597.nickpiggin@yahoo.com.au>
Date:	Thu, 21 Aug 2008 03:55:54 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ray Lee <ray-lk@...rabbit.org>, adobriyan@...il.com,
	Ingo Molnar <mingo@...e.hu>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Aneesh Kumar KV <aneesh.kumar@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Chris Friesen <cfriesen@...tel.com>
Subject: Re: VolanoMark regression with 2.6.27-rc1

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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