linux-kernel - Re: [ANNOUNCE] mdb: Merkey's Linux Kernel Debugger 2.6.27-rc4 released

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Message-Id: <1219313231.8651.101.camel@twins>
Date:	Thu, 21 Aug 2008 12:07:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	jmerkey@...fmountaingroup.com
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Paul E McKenney <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>
Subject: Re: [ANNOUNCE] mdb: Merkey's Linux Kernel Debugger 2.6.27-rc4
	released

On Wed, 2008-08-20 at 20:50 -0600, jmerkey@...fmountaingroup.com wrote:

>  volatiles left in the code due to the previously stated
>  (and still present) severe breakage of the GNU compiler with SMP 
>  shared data.  most of the barrier() functions are just plain broken
>  and do not result in proper compiler behavior in this tree. 

Can you provide explicit detail?

By using barrier() the compiler should clobber all its memory and
registers therefore forcing a write/reload of the variable.



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