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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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UUID_TIME(3)							    Libuuid API 						      UUID_TIME(3)

NAME
uuid_time - extract the time at which the UUID was created SYNOPSIS
#include <uuid.h> time_t uuid_time(uuid_t uu, struct timeval *ret_tv) DESCRIPTION
The uuid_time function extracts the time at which the supplied time-based UUID uu was created. Note that the UUID creation time is only encoded within certain types of UUIDs. This function can only reasonably expect to extract the creation time for UUIDs created with the uuid_generate_time(3) and uuid_generate_time_safe(3) functions. It may or may not work with UUIDs created by other mechanisms. RETURN VALUES
The time at which the UUID was created, in seconds since January 1, 1970 GMT (the epoch), is returned (see time(2)). The time at which the UUID was created, in seconds and microseconds since the epoch, is also stored in the location pointed to by ret_tv (see gettimeofday(2)). AUTHOR
Theodore Y. Ts'o AVAILABILITY
libuuid is part of the util-linux package since version 2.15.1 and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. SEE ALSO
uuid(3), uuid_clear(3), uuid_compare(3), uuid_copy(3), uuid_generate(3), uuid_is_null(3), uuid_parse(3), uuid_unparse(3) util-linux May 2009 UUID_TIME(3)
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