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Date: Sun, 16 Nov 2008 11:35:57 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-core] [Xenomai-commits] r4392 -
	/trunk/include/asm-x86/arith_64.h
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai-core <xenomai@xenomai.org>

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Gilles Chanteperdrix wrote:
> Author: gch
> Date: Sun Nov 16 03:30:40 2008
> New Revision: 4392
>=20
> URL: http://svn.gna.org/viewcvs/xenomai?rev=3D4392&view=3Drev
> Log:
> Implement nodiv_ullimd on x86_64
>=20
> Modified:
>     trunk/include/asm-x86/arith_64.h

Nice. This solves the user-triggerable kernel oops due to idiv overflows
in the original version (rt_task_sleep_until(1LL<<63);). I happened to
receive such a bug report on Friday and was about to consider
alternative solutions beyond limit checks.

But how accurate is this conversion? I mean how many bits can we lose
when doing xnarch_ns_to_tsc(xnarch_tsc_to_ns(x))?

Final question: Already prepared a 32-bit version? :)

Jan



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