Re: 2.6.14-rc4-rt7

[john stultz <johnstul@us.ibm.com>]

On Wed, 2005-10-26 at 21:37 -0400, Steven Rostedt wrote:
> On Wed, 2005-10-26 at 18:22 -0700, john stultz wrote:
> 
> > 
> > I don't know if that would really fix it, because ideally you want to
> > read the prev_mono_time at the same point you calculate the time inside
> > the read lock'ed critical section.
> 
> Ideally yes, but this is just for debugging, so as long as prev is read
> before now, this should prevent false positives due to ordering.  

Ah, you're right, good point! I was being overly paranoid.

So as long as the writing of the 64bit value is atomic (which it isn't,
but that can be fixed) there shouldn't be ordering problems w/ your
patch. 

And sure enough, it seems to take care of the warnings on my box.

Great debugging job!
-john

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