Re: [parisc-linux] SMP kernels for an HP J5600

Re: [parisc-linux] SMP kernels for an HP J5600

[Grant Grundler]

On Mon, Aug 23, 2004 at 04:56:25PM +0000, Joel Soete wrote:
> >Last week I managed to install debian woody onto an HP J5600, using a 
...
> hmm j5600 is a sister of my b2k (may be can I sent you my .config file to 
> test?)

correct. He should be able to use the linux-2.6 c3000_config file.

> >What is the current recommended stable kernel for this machine, and for 
> >running an smp kernel? Is 2.6.x stable enough on hppa yet?
> >
> A lot of improvement :) (just take care to grab it from 
> <http://cvs.parisc-linux.org/download/>)

2.6 kernels and source tarballs are available here:
	http://cvs.parisc-linux.org/download/linux-2.6/

We currently do not auto-build a 32-bit SMP kernel and that's what
I suggest you try first. Grab the latest source tarball, tweak
arch/parisc/configs/c3000_config to enable SMP, and "make".

Note PARISC SMP support has only recently been fixed in our linux-2.6
tree (thanks jejb, tausq!) and hasn't been broadly tested.

But the same bugs jejb found still exist in 2.4 kernels.
Kyle McMartin is looking at back porting those fixes and could
probably use help with the N4K and "mb() in spinlock()" patches.

hth,
grant
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Re: [parisc-linux] SMP kernels for an HP J5600

[Joel Soete]

> On Mon, Aug 23, 2004 at 11:01:11PM -0600, Grant Grundler wrote:
> > But the same bugs jejb found still exist in 2.4 kernels.
> > Kyle McMartin is looking at back porting those fixes and could
> > probably use help with the N4K and "mb() in spinlock()" patches.
> > 
> I passed the torch to Joel for this, :)
> 
Need a bit help:
_atomic_spin_[...], _raw_spin[...] are not in 2.4, exact?

in 2.4
I meet:
#define spin_lock(x) do { \
	while (__ldcw (&(x)->lock) =3D=3D 0) \
		while ((x)->lock =3D=3D 0) ; \
} while (0)

may I suggest to replace such thing by:
static inline void spin_lock(spinlock_t *x)
{
	volatile unsigned int *a;

	mb();
	a =3D __ldcw_align(x);
	while (__ldcw(a) =3D=3D 0)
		while (*a =3D=3D 0);
	mb();
}

Thanks in advance for feedback,
    Joel



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