linux-kernel - Re: [PATCH 3/3] relay: Add buffer-only channels; useful for early logging.

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Date:	Sat, 5 Jul 2008 07:14:01 +0300
From:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	tzanussi@...il.com, penberg@...helsinki.fi,
	torvalds@...ux-foundation.org, compudj@...stal.dyndns.org,
	vegard.nossum@...il.com, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 3/3] relay: Add buffer-only channels; useful for early
 logging.

On Wed, 2 Jul 2008 23:06:36 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:
 
> This breaks on sparc64.
> 
> > +			err = smp_call_function_single(i,
> > +
> > __relay_set_buf_dentry,
> > +						       &disp, 0,
> > 1);
> 
> Because that ain't implemented.
> 
> There's a call in net/iucv/iucv.c, but that's s390-only.
> 
> There's a call in virt/kvm/kvm_main.c.
> 
> There's a call in kernel/time/tick-broadcast.c, so I assume that the
> intersection between CONFIG_GENERIC_CLOCKEVENTS_BROADCAST and
> non-smp_call_function_single() architectures is presently empty.

Hi,

I'm not sure what I should do. Maybe disable relay_late_setup_files()
on sparc64, with an empty inline?
 
> I guess all SMP-capable architectures should now implement this,
> please.  It is presently defined on all architectures for CONFIG_SMP=n
> and it is declared in include/linux/smp.h.

sparc64 seems to have smp_call_function_mask(). If we have the generic
kernel/smp.c in linux-next or -mmotm, then this will define
smp_call_function_single() to call smp_call_function_mask().

Is there anything I can do regarding this patch? Does it work since
kernel/smp.c reappeared?


	Eduard
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