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Full Discussion: problem with kernel module loading
Operating Systems Linux problem with kernel module loading Post 302253116 by iamjayanth on Friday 31st of October 2008 03:45:43 AM
Old 10-31-2008
problem with kernel module loading
Hi masters,

I am new to linux and unix forum and this is my first forum. So please excuse if
I am not giving sufficient information. I will give them on request.
I have created a bandwidth manager module. I am using a 2.6.9 kernel and in Red Hat 3.4.3 distribution. But when i run make following warnings are displayed with zero error.


*** Warning: "__fixsfsi" [/root/bandwidth_management/kqos.ko] undefined!
*** Warning: "__mulsf3" [/root/bandwidth_management/kqos.ko] undefined!
*** Warning: "__divsf3" [/root/bandwidth_management/kqos.ko] undefined!
*** Warning: "__addsf3" [/root/bandwidth_management/kqos.ko] undefined!
*** Warning: "__floatsisf" [/root/bandwidth_management/kqos.ko] undefined!


Since no errors are there i insmod the module using insmod kqos.ko but it failed with an error
error inserting 'kqos.ko': -1 Unknown symbol in module

I gave dmesg and it also gave error(my module name is kqos)

kqos: Unknown symbol __divsf3
kqos: Unknown symbol __fixsfsi
kqos: Unknown symbol __floatsisf
kqos: Unknown symbol __mulsf3
kqos: Unknown symbol __addsf3

I tried it on the google and from some forum I got the feeling that(I am not sure) these symbols are related with some floating point operations which are not allowed inside the kernel. I am sure that there is no floating point operation in the module code .Can anyone tell me what can i do correct this error. Thanking you in advance......

Also if anyone can tell me where can i get any good documents (pdf or html or doc )on kernel threads and NPTL and kernel thread programming . I already have the following documents titled "The Native POSIX Thread Library for Linux". I am looking for another document.
Thanking you again...
 

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ctrlaltdel

CTRLALTDEL(8)						       System Administration						     CTRLALTDEL(8)

NAME

       ctrlaltdel - set the function of the Ctrl-Alt-Del combination

SYNOPSIS

       ctrlaltdel hard|soft

DESCRIPTION

       Based  on examination of the linux/kernel/sys.c code, it is clear that there are two supported functions that the Ctrl-Alt-Del sequence can
       perform: a hard reset, which immediately reboots the computer without calling sync(2) and without any other preparation; and a soft  reset,
       which sends the SIGINT (interrupt) signal to the init process (this is always the process with PID 1).  If this option is used, the init(8)
       program must support this feature.  Since there are now several init(8) programs in the Linux community, please consult	the  documentation
       for the version that you are currently using.

       ctrlaltdel is usually used in the /etc/rc.local file.

FILES

       /etc/rc.local

SEE ALSO

       simpleinit(8), init(8)

AUTHOR

       Peter Orbaek (poe@daimi.aau.dk)

AVAILABILITY

       The ctrlaltdel command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							   October 1993 						     CTRLALTDEL(8)
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