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SubjectRe: [ANNOUNCE] mdb: Merkey's Linux Kernel Debugger 2.6.27-rc4 released
Peter Zijlstra wrote:
> On Wed, 2008-08-20 at 20:50 -0600, jmerkey@wolfmountaingroup.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.

I hope Jeff didn't try mere barrier()s only. smp_wmb() and smp_rmb()
are the more relevant barrier variants for mdb, from what I remember
when I last looked at it.
--
Stefan Richter
-=====-==--- =--- =-=-=
http://arcgraph.de/sr/

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