Re: [Xenomai] core-3.5 for x86

[Jan Kiszka <jan.kiszka@web.de>]

On 2012-12-15 20:16, Gilles Chanteperdrix wrote:
> On 12/15/2012 11:03 PM, Wolfgang Mauerer wrote:
> 
>> Hi Gilles,
>>
>> On 15/12/2012 22:24, Gilles Chanteperdrix wrote:
>>
>>> I see some (recent) activity on this git repository:
>>> https://github.com/siemens/ipipe/commits/core-3.5_for-upstream
>>>
>>> In what state is this branch, can I pull from it?
>> please don't pull yet, I need to port a few more patches forward
>> and fix one known issue with the tree. But I'll try to send a
>> pull/discussion request next week.
>>
>>> At least the changes allowing preempt_disable()/preempt_enable() to be
>>> called from non-root context look dubious.
>> are you referring to 767f0d43fe3? This one still carries a TODO
>> item in the description to remind me to check with which
>> non-x86 archs this can cause problems, and what we can do about
>> them.
> 
> 
> Actually, we already have ipipe_safe_current(), so I guess what you need
> is ipipe_safe_current_thread_info() ?

That cannot work unless you patch all the ftrace and perf stack - which
would surely not be a good idea /wrt maintainability.

The point is remove the instrumentation from preempt_disable/enable at
least on those archs that do not need it. And then to look at the archs
that still have stack-based thread_info, if we cannot change this, at
least for CONFIG_IPIPE enabled.

Jan


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