Re: 2.6.14-rt15: cannot build with !PREEMPT_RT

Lee Revell
2005-11-28T21:08:33Z

On Mon, 2005-11-28 at 17:00 +0100, Ingo Molnar wrote:
> * Lee Revell <rlrevell@joe-job.com> wrote:
>
> > On Mon, 2005-11-28 at 12:48 +0100, Ingo Molnar wrote:
> > > which was the last -rt kernel that worked fine for you in
> > > PREEMPT_DESKTOP mode?
> >
> > It has been a long time, possibly months - I've mostly been using
> > PREEMPT_RT. But now I am working on a soft RT project that for
> > various reasons would like to use the mainline kernel, and I've found
> > it still has some scheduling bumps up to 5-7ms and am trying to
> > identify the problem.
>
> ok.
>
> > Would you like me to do a binary search?
>
> that would certainly be very helpful!
>

With 2.6.13-rc4-RT-V0.7.52-02 (the oldest version I still have around) I
still can't build that config, but it fails with:

LD .tmp_vmlinux1
net/built-in.o: In function `rt_check_expire':
route.c:(.text+0x1a66a): undefined reference to `__bad_spinlock_type'
route.c:(.text+0x1a68d): undefined reference to `__bad_spinlock_type'
net/built-in.o: In function `rt_run_flush':
route.c:(.text+0x1a7c1): undefined reference to `__bad_spinlock_type'
route.c:(.text+0x1a7d9): undefined reference to `__bad_spinlock_type'
net/built-in.o: In function `rt_garbage_collect':
route.c:(.text+0x1aa2a): undefined reference to `__bad_spinlock_type'
net/built-in.o:route.c:(.text+0x1aa55): more undefined references to
`__bad_spinlock_type' follow
make: *** [.tmp_vmlinux1] Error 1

AFAICT all the realtime-preempt patches have references to
__bad_spinlock_type but none of them ever define it - I can't figure out
what's going on.

I'll try to build something older.

Lee