On Thu, Feb 12, 2009 at 7:59 AM, Daniel Widyanto <[email protected]> wrote: > Hi, > > If I'm not mistaken, there were several reports on Ubuntu forum > regarding kernel vs GCC version compatibility. The error was same as > yours: fail at __udivdi3 (and several floating point functions) linking > stage. Maybe that's the real issue. >
Thanks for pointing that out. Upon going through those posts I found that the problem is with gcc v4.3 but mine is gcc v4.2.4. > Try to rebuilt/recompile your kernel with your current GCC (without your > module). See whether the kernel can compile cleanly or fail during the > linking stage. I should try that out. > Regarding division, the floating point division needs the FPU (which may > not be used during the kernel mode - The reason why previous author > suggest you to avoid floating point operation) . Or soft-floating point > library (assuming it's configured and compiled in the kernel source > tree) > yes i was aware of that, but there are no issues with integer division. And I was trying that only. I had checked this thing works by building a module (unfortunately, at that time I didn't tried u64 division). If I am not wrong, the do_div macro (defined in arch/x86/include/asm/div64.h) precisely does the same. If that is what you meant by "soft-floating point" library, please pardon my ignorance. Thanks and Regards Sukanto Ghosh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
