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From: "Robert P. J. Day" <rpjday@mindspring.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: from where comes "__moddi3"?
Date: Sat, 21 Jul 2007 15:21:25 -0400 (EDT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0707211516480.6972@localhost.localdomain> (raw)


  again, probably displaying my abject ignorance, but i wrote a
trivial module that tries to "var % 15", and i get:

  WARNING: "__moddi3" undefined!

and, not surprisingly, when i try to insmod:

  insmod: error inserting 'seq.ko': -1 Unknown symbol in module

(using 16 rather than 15 works fine, as i assume that the modulus
call is simply replaced by an optimized  bitwise comparison.)

  so ... from where comes __moddi3?  i know there are places in the
kernel source tree that do non-power-of-2 moduli, and they work fine,
no?  thanks.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://fsdev.net/wiki/index.php?title=Main_Page
========================================================================

             reply	other threads:[~2007-07-21 19:23 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-07-21 19:21 Robert P. J. Day [this message]
2007-07-21 19:31 ` Peter Zijlstra
2007-07-21 19:34   ` Robert P. J. Day
2007-07-21 19:58   ` Jan-Benedict Glaw
2007-07-21 20:00     ` Peter Zijlstra
2007-07-21 19:33 ` Alexander Shishkin
2007-07-21 19:34   ` Jan Engelhardt
2007-07-21 20:00     ` Alexander Shishkin
2007-07-21 21:27       ` David Schwartz
2007-07-21 22:02         ` Arjan van de Ven

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