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Date: Mon, 19 Oct 2009 21:10:55 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-core] [PATCH v2 1/3] nucleus: Use Linux spin lock for
	heap list management
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org

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Gilles Chanteperdrix wrote:
> Jan Kiszka wrote:
>> No need for hard nklock protection of kheapq and the map counter, a
>> normal spin lock suffices as all users must run over the root thread
>> anyway.
>=20
> At the very least, this should use rthal_spin_lock, in order to seem to=

> respect the layering.

Then the conversion would make no sense (hard interrupt lock again).
Given that we are fiddling with Linux mm directly here, there is no hal
involved.

>=20
> Anyway, do we really want to change this now?
>=20

That's a different question. The patch alone does not buy us that much
when we cannot reuse the lock for the heapq.

Jan

PS: More invasive changes will come anyway to plug cleanup races in the
heap code.


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