Re: linux-next: Tree for July 18: warning at kernel/lockdep.c:2068trace_hardirqs_on_caller

From: Greg KH
Date: Sat Jul 19 2008 - 18:20:59 EST

On Sat, Jul 19, 2008 at 02:59:12PM +0200, Vegard Nossum wrote:
> On Sat, Jul 19, 2008 at 11:55 AM, Vegard Nossum <vegard.nossum@xxxxxxxxx> wrote:
> > What I don't get here is how SLUB can be used this early in the boot
> > process. Notice that this is still miles away from the
> >
> > SLUB: Genslabs=12, HWalign=128, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
> >
> > line, which comes much later. And that kobject_init() _is_ calling
> > kzalloc() via verify_dynamic_kobject_allocation(). Isn't this an
> > error?
> >
> > (Unfortunately, my "git log" doesn't turn up any recent changes for
> > any of the affected code paths here.)
> Ehe... and this is the reason why: The code was added by this patch:
> commit 0e3638d1e04040121af00195f7e4628078246489
> Author: Dave Hansen <haveblue@xxxxxxxxxx>
> Date: Thu Mar 16 17:30:16 2006 -0800
> warn when statically-allocated kobjects are used
> ..which only exists in -next. Is that just a truly ancient patch, or
> did somebody forget to adjust their clock?

It is truely a very old patch, that only lives in my tree, and currently
isn't planned to go to Linus any year soon.

But it has a very long history of living in the -mm tree, and finding
real bugs, it's just not "safe" enough to go to Linus's tree. Unless
you think it is?


greg k-h
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