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From: "Matteo Facchinetti @ Sirius Electronic Systems S.R.L." <matteo.facchinetti@domain.hid>
To: xenomai@xenomai.org
Subject: [Xenomai-core] rtdm_mmap_to_user() remapping problem on powerpc arch.
Date: Wed, 29 Oct 2008 11:34:08 +0100	[thread overview]
Message-ID: <49083C20.6060306@domain.hid> (raw)

Hi all,

I'm using framework RTDM to develop my driver on embedded system mpc5200 
based.
(kernel 2.6.24.4 (powerpc arch) - xenomai 2.4.3).

I've need to use rtdm_mmap_to_user() to share a kmalloc() kernel memory 
in userspace.
For this, I'm using the example in  
http://www.captain.at/xenomai-real-time-driver-example.php.

Running a similar example I've discovered a problem in kmalloc remapping.
The only way that I've found, to make remapping correctly, is to 
allocate an entire kernel mem page with __get_freepage() instead of 
kmalloc().

I think that could be a bug in powerpc arch.
what do you think about?





             reply	other threads:[~2008-10-29 10:34 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-29 10:34 Matteo Facchinetti @ Sirius Electronic Systems S.R.L. [this message]
2008-10-29 13:49 ` [Xenomai-core] rtdm_mmap_to_user() remapping problem on powerpc arch Gilles Chanteperdrix

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