[Linux-ia64] size of spinlock_t

[Linux-ia64] size of spinlock_t

[Ray Bryant]

In experimenting with new numa lock implementation, I changed the size
of spinlock_t to 16 bytes.  The resulting kernel hangs on our SN
hardware just after printing "All processors have done init_idle".  Now
it is possible this is something peculiar to the SGI kernels, but I was
wondering if anyone knew of places in the IA64 kernel that "know" that
sizeof(spinlock_t)=8 and don't work correctly if this is changed.

-- 
Best Regards,
Ray
-----------------------------------------------
Ray Bryant               SGI
512-453-9679 (work)      512-507-7807 (cell)
raybry@sgi.com           raybry@austin.rr.com
     Computers are like air conditioners.
   They stop working when you open Windows.
-----------------------------------------------

Re: [Linux-ia64] size of spinlock_t

[David Mosberger]

>>>>> On Fri, 15 Feb 2002 00:14:55 -0600, Ray Bryant <raybry@engr.sgi.com> said:

  Ray> In experimenting with new numa lock implementation, I changed
  Ray> the size of spinlock_t to 16 bytes.  The resulting kernel hangs
  Ray> on our SN hardware just after printing "All processors have
  Ray> done init_idle".  Now it is possible this is something peculiar
  Ray> to the SGI kernels, but I was wondering if anyone knew of
  Ray> places in the IA64 kernel that "know" that
  Ray> sizeof(spinlock_t)=8 and don't work correctly if this is
  Ray> changed.

Are you sure it's not just include/asm/offsets.h that's out of date?
Make sure you have no stray arch/ia64/tools/print_offsets.s file and
then rerun make dep.

	--david

Re: [Linux-ia64] size of spinlock_t

[Ray Bryant]

Yes that was it.  Thanks.  I am totally amazed that "make clean; make
vmlinux" did not remake offsets.h.

David Mosberger wrote:
> 
> >>>>> On Fri, 15 Feb 2002 00:14:55 -0600, Ray Bryant <raybry@engr.sgi.com> said:
> 
>   Ray> In experimenting with new numa lock implementation, I changed
>   Ray> the size of spinlock_t to 16 bytes.  The resulting kernel hangs
>   Ray> on our SN hardware just after printing "All processors have
>   Ray> done init_idle".  Now it is possible this is something peculiar
>   Ray> to the SGI kernels, but I was wondering if anyone knew of
>   Ray> places in the IA64 kernel that "know" that
>   Ray> sizeof(spinlock_t)=8 and don't work correctly if this is
>   Ray> changed.
> 
> Are you sure it's not just include/asm/offsets.h that's out of date?
> Make sure you have no stray arch/ia64/tools/print_offsets.s file and
> then rerun make dep.
> 
>         --david
> 
> _______________________________________________
> Linux-IA64 mailing list
> Linux-IA64@linuxia64.org
> http://lists.linuxia64.org/lists/listinfo/linux-ia64

-- 
Best Regards,
Ray
-----------------------------------------------
Ray Bryant               SGI
512-453-9679 (work)      512-507-7807 (cell)
raybry@sgi.com           raybry@austin.rr.com
     Computers are like air conditioners.
   They stop working when you open Windows.
-----------------------------------------------