From: Jan Kiszka <jan.kiszka@domain.hid>
To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai-core <xenomai@xenomai.org>
Subject: Re: [Xenomai-core] [Xenomai-commits] r4392 - /trunk/include/asm-x86/arith_64.h
Date: Sun, 16 Nov 2008 11:35:57 +0100 [thread overview]
Message-ID: <491FF78D.9000609@domain.hid> (raw)
In-Reply-To: <E1L1XPO-0006Xh-1s@domain.hid>
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Gilles Chanteperdrix wrote:
> Author: gch
> Date: Sun Nov 16 03:30:40 2008
> New Revision: 4392
>
> URL: http://svn.gna.org/viewcvs/xenomai?rev=4392&view=rev
> Log:
> Implement nodiv_ullimd on x86_64
>
> 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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next parent reply other threads:[~2008-11-16 10:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1L1XPO-0006Xh-1s@domain.hid>
2008-11-16 10:35 ` Jan Kiszka [this message]
2008-11-16 12:13 ` [Xenomai-core] [Xenomai-commits] r4392 - /trunk/include/asm-x86/arith_64.h Gilles Chanteperdrix
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