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Message-ID: <DA6197CAE190A847B662079EF7631C0602E1B7D5@OEKAW2EXVS03.hbi.ad.harman.com>
Date:	Tue, 22 Aug 2006 10:33:09 +0200
From:	"Jurzitza, Dieter" <DJurzitza@...manbecker.com>
To:	<linux-kernel@...r.kernel.org>
Subject: 

Dear Mr. Miller,
dear listmembers,

I have been gently advised to send this message to the list directly, so here you go. Sorry for the bounces:


the posting below I sent initially in 2004 - quite some time ago. See below. Sorry, maybe I sent to debian sparc instead of sparclinux, and I did not make a CC to sparclinux right now. Here you see two debug - inputs "Size of table: 1843, what is too much to work, because SPARC 64 off stock can only do 1820 for Size of table.

     Dec 13 09:35:10 oekalux09 syslogd 1.4.1#16: restart.
     Dec 13 09:35:10 oekalux09 kernel: klogd 1.4.1#16, log source = /proc/kmsg started.
     Dec 13 09:35:10 oekalux09 kernel: Inspecting /boot/System.map-2.4.26-SMP
     Dec 13 09:35:11 oekalux09 kernel: Loaded 14411 symbols from /boot/System.map-2.4.26-SMP.
     Dec 13 09:35:11 oekalux09 kernel: Symbols match kernel version 2.4.26.
**** Dec 13 09:35:11 oekalux09 kernel: Loading kernel module symbols - Size of table: 1843 Sizeof alloc: >>117952 /* debugging */
**** Dec 13 09:35:11 oekalux09 kernel: We use __GLIBC__ for klogd  /* debugging */
>>>> Dec 13 09:35:11 oekalux09 kernel: Error reading kernel symbols - Cannot allocate memory
     Dec 13 09:35:11 oekalux09 kernel: Errno was: -1 
     Dec 13 09:35:11 oekalux09 kernel: PROMLIB: Sun IEEE Boot Prom 3.23.1 1999/07/16 12:08
     Dec 13 09:35:12 oekalux09 kernel: Linux version 2.4.26-SMP (root@...alux09) (gcc-Version 3.3.4 (Debian 1:3.3.4-13)) #1 SMP Mo Dez 13 09:01:5

And the root cause is:
> What I found is that the allocation works up to 1820 elements
> of the size 72 Bytes, however, we would need a tiny little 
> more (1843 in my case, please take a look into the attachement).

and the solution is: use an unsigned int rather than an unsigned long for "value" in struct kernel_sym. The reason for this I (I think) explained. And the only possible cause is the fact that sizeof (unsgned long) in kernel space is 8 and not 4, because the array of char in struct kernel_sym cannot cause this.

Using my suggested patch I get (today since then ...) no error, no warning:

Aug 15 06:48:54 oekalux08 syslogd 1.4.1: restart.
Aug 15 06:48:55 oekalux08 in.identd[634]: started
Aug 15 06:48:59 oekalux08 kernel: klogd 1.4.1, log source = /proc/kmsg started. Aug 15 06:48:59 oekalux08 kernel: Inspecting /boot/System.map-2.4.33-SMP Aug 15 06:49:00 oekalux08 kernel: Loaded 14439 symbols from /boot/System.map-2.4.33-SMP. Aug 15 06:49:00 oekalux08 kernel: Symbols match kernel version 2.4.33. Aug 15 06:49:00 oekalux08 kernel: Loaded 241 symbols from 11 modules. Aug 15 06:49:00 oekalux08 kernel: ip_tables: (C) 2000-2002 Netfilter core team Aug 15 06:49:00 oekalux08 kernel: ip_conntrack version 2.1 (4015 buckets, 32120 max) - 416 bytes per conntrack


If you say this cannot work: please be more specific. If you need even debug output showing exactly this, I can provide. As a matter of fact: it works. If the reason why it works differs from my explanation I would highly appreciate to be told why. Just saying: "I cannot see why this should work" is hardly of any help for understanding things.

Take care



Dieter Jurzitza


-- 
________________________________________________

HARMAN BECKER AUTOMOTIVE SYSTEMS

Dr.-Ing. Dieter Jurzitza
Manager Hardware Systems
   System Development

Industriegebiet Ittersbach
Becker-Göring Str. 16
D-76307 Karlsbad / Germany

Phone: +49 (0)7248 71-1577
Fax:   +49 (0)7248 71-1216
eMail: DJurzitza@...manbecker.com
Internet: http://www.becker.de
 


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