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Date: Fri, 08 Feb 2013 10:02:59 +0100
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai] Backport Xenomai-26 to Linux 2.6.29.1
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To: Matteo Facchinetti <matteo.facchinetti@sirius-es.it>
Cc: xenomai@xenomai.org

On 02/08/2013 09:57 AM, Matteo Facchinetti wrote:
> Hi,
>
> We decided to try to backport the
> adeos-ipipe-2.6.36.4-powerpc-2.12-05.patch against the Linux 2.6.29.1
> kernel but we encountered problems with spinlock handling:
>
> In the 2.6.29 kernel, we found some differences about spinlock
> structures hierarchy. In detail at kernel side we have only
> raw_spinlock_t and spinlock_t but xenomai (ipipe_lock.h) uses
> arch_spinlock_t, raw_spinlock_t and spinlock_t.
> Those differences will force us to heavily modify the spinlock handling
> in the xenomai patch, deleting a layer and replacing arch_spinlock_t
> with raw_spinlock_t and raw_spinlock_t with spinlock_t.
>
> Is there an old patch file that contains spinlock handling compliant
> with 2.6.29.1 kernel and xenomai 2.6?
>

This is clearly an area of the I-pipe code you should NOT backport, at 
all. You should keep the one avail with 2.6.29.1, and fix up the 
generic/arch-dep portions of the pipeline code accordingly.


-- 
Philippe.