linux-kernel - Re: [RFC] div64

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Message-ID: <20070224161916.GL3982@m.safari.iki.fi>
Date:	Sat, 24 Feb 2007 18:19:16 +0200
From:	Sami Farin <7atbggg02@...akemail.com>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC] div64_64 support

On Fri, Feb 23, 2007 at 17:05:27 -0800, Stephen Hemminger wrote:
> Since there already two users of full 64 bit division in the kernel,
> and other places maybe hiding out as well. Add a full 64/64 bit divide.
> 
> Yes this expensive, but there are places where it is necessary.
> It is not clear if doing the scaling buys any advantage on 64 bit platforms,
> so for them a full divide is done.

Still does not work after these fixes... how came?

WARNING: "div64_64" [net/netfilter/xt_connbytes.ko] undefined!
WARNING: "div64_64" [net/ipv4/tcp_cubic.ko] undefined!

--- linux-2.6.19/include/asm-i386/div64.h.bak	2006-11-29 23:57:37.000000000 +0200
+++ linux-2.6.19/include/asm-i386/div64.h	2007-02-24 16:24:55.822529880 +0200
@@ -45,4 +45,7 @@ div_ll_X_l_rem(long long divs, long div,
 	return dum2;
 
 }
+
+extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
+
 #endif
--- linux-2.6.19/lib/div64.c.bak	2007-02-24 16:10:03.686084000 +0200
+++ linux-2.6.19/lib/div64.c	2007-02-24 17:01:11.224517353 +0200
@@ -80,4 +80,6 @@ uint64_t div64_64(uint64_t dividend, uin
 	return dividend;
 }
 
+EXPORT_SYMBOL(div64_64);
+
 #endif /* BITS_PER_LONG == 32 */

-- 
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