Messages in this thread |  | | | Date | Wed, 2 Jul 2008 23:06:36 -0700 | | From | Andrew Morton <> | | Subject | Re: [PATCH 3/3] relay: Add buffer-only channels; useful for early logging. |
On Mon, 23 Jun 2008 15:31:04 +0300 Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> wrote:
> Allows one to create and use a channel with no associated files. Files
> can be initialized later. This is useful in scenarios such as logging
> in early code, before VFS is up. Therefore, such channels can be
> created and used as soon as kmem_cache_init() completed.
>
> This is needed by kmemtrace to do tracing in early kernel code.
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.
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.
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