Bug#538332: linux-2.6: [x86] Null pointer dereference in hrtick_start_fair.

[dann frazier <dannf@dannf.org>]

On Mon, Jul 27, 2009 at 02:06:34PM -0700, Alok Kataria wrote:
> 
> > > I see, though I must say that its really confusing for a person like me,
> > > I had assume that kernel version 2.6.26 will have all the stuff from the
> > > vanilla tree, but it seems you do things differently. 
> > 
> > We may still be talking about two different things. We are based upon
> > the vanilla 2.6.26 tree, but the tsc merging didn't appear to happen
> > unil 2.6.27-rc1.
> > 
> > Specifically, the tsc.c file was introduced here:
> > 
> > commit 0ef95533326a7b37d16025af9edc0c18e644b346
> > Author: Alok Kataria <akataria@vmware.com>
> > Date:   Tue Jul 1 11:43:18 2008 -0700
> > 
> >     x86: merge sched_clock handling
> >     
> >     Move the basic global variable definitions and sched_clock
> >     handling in the
> >     common "tsc.c" file.
> >     
> >      - Unify notsc kernel command line handling for 32 bit and 64bit.
> >      - Functional changes for 64bit.
> >             - "tsc_disabled" is updated if "notsc" is passed at
> > 	    boottime.
> >             - Fallback to jiffies for sched_clock, incase notsc is
> > 	    passed on
> >           commandline.
> >     
> >     Signed-off-by: Alok N Kataria <akataria@vmware.com>
> >     Signed-off-by: Dan Hecht <dhecht@vmware.com>
> >     Cc: Dan Hecht <dhecht@vmware.com>
> >     Signed-off-by: Ingo Molnar <mingo@elte.hu>
> > 
> > dannf@krebs:~/git/linux-2.6$ git name-rev 0ef95533326a7b37d16025af9edc0c18e644b346
> > 0ef95533326a7b37d16025af9edc0c18e644b346 tags/v2.6.27-rc1~1102^2~72
> 
> Okay.
> 
> I was looking at 
> -bash-3.2$ git describe 0ef95533326a7b37d16025af9edc0c18e644b346
> v2.6.26-rc9-715-g0ef9553
> 
> Which made me think that it should be in the 2.6.26 vanilla release, but
> I think git-describe shows the time-frame when it hit Ingo's tip tree.
> That seemed to have confused me. 

Ah, ok - that makes sense.

-- 
dann frazier