Yes Kernel does not allow for floating point calculations since the virtual
memory footprint is different as compared to the User space.
In addition, one needs to be careful as to the style of module writing in
case of Kernel space as compared to the user space. Infact keep in mind to
use more dynamic allocation of memory
Ashish
On Mon, Mar 5, 2012 at 3:24 AM, rong <rong1...@gmail.com> wrote:
> The first two errors suggest you didn't declared that your module is
> GPL compatible, i.e. missing the following line or similar in your
> source code.
>
> The rest suggest you have used floating point calculations in your
> module. Kernel doesn't do floating point calculations. Find yourself
> some workarounds.
>
> Regards,
> Rong
>
>
> MODULE_LICENSE("GPL v2");
>
> On Mar 5, 1:19 pm, Apurva Jaiswal <jaiswal.apu...@gmail.com> wrote:
> > Hello,
> >
> > The dmesg error is as follows
> >
> > <4>[56941.357788] ec: Unknown symbol tcp_get_info (err 0)
> > <4>[56941.360656] ec: Unknown symbol debugfs_remove (err 0)
> > <4>[56941.362548] ec: Unknown symbol __aeabi_fdiv (err 0)
> > <4>[56941.364440] ec: Unknown symbol __aeabi_ui2f (err 0)
> > <4>[56941.366546] ec: Unknown symbol __aeabi_fmul (err 0)
> > <4>[56941.369079] ec: Unknown symbol __aeabi_f2uiz (err 0)
> >
> > I hope this provides a lot more info and suggest that something is
> > wrong with the module. The kernel module was compiled with the exact
> > kernel source as in the device, but the device is currently having the
> > stock kernel obtained from AOSP site. So I guess the android kernel in
> > order to let install this module requires to have some more
> > configuration enabled. I guess I will have to flash the custom kernel
> > on the device and then try insmod.
> >
> > Any comments?
> >
> > Thanks and Regards,
> >
> > Apurva Jaiswal
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > On Mon, Mar 5, 2012 at 2:17 AM, rong <rong1...@gmail.com> wrote:
> > > Okay, this is a easy one. But first of all, I found a lot of questions
> > > posted on this group are actually fairly basic and not specifically
> > > related to Android kernel, you may find better chance to get those
> > > questions answered and more instantly on other Linux kernel
> > > development forum.
> >
> > > Back to the question, it did find your file, except somehow either
> > > your module_init function didn't return 0 (for correct initialization)
> > > instead it returned -ENOENT, which was why insmod printed out that
> > > "not found" message, or are you sure you have cross-compiled your
> > > module with proper toolchain? Regarding your question about
> > > limitation, no I'm not aware of any.
> >
> > > Cheers,
> > > Rong
> >
> > > On Mar 4, 11:12 am, "Apurva Jaiswal." <jaiswal.apu...@gmail.com>
> > > wrote:
> > >> I followed the steps in the forum (
> http://www.schaeuffelhut.de/wordpress/?p=237&cpage=1#comment-384) to get
> > >> the linux kernel source and and cross compile my module. The kernel
> version
> > >> of the google nexus one is exactly the same as in the forum. I
> initially
> > >> tested with my test module hello-1.ko which got installed on the
> android
> > >> device successfully. But when I am installing my module ec.ko on the
> > >> android device using insmod, I get the following error.
> >
> > >>
> > >> apurva@apurva-Inspiron-1464:~/RA/MultFlowSync_Ahmad/thesiscode_final/androi
> d_ec/ec$
> > >> adb shell
> >
> > >> $ cd sdcard/data/ec
> >
> > >> $ ls
> >
> > >> ec.ko
> >
> > >> $ su
> >
> > >> # insmod ec.ko
> >
> > >> insmod: init_module 'ec.ko' failed (No such file or directory)
> >
> > >> #
> >
> > >> It is clear that the file ec.ko is present. But I am not sure why it
> is
> > >> not picking the file. I did the same thing for hello-1.ko and it gets
> > >> insmod pretty fine. There is no permission issue, and ec.ko gets the
> same
> > >> permission as was obtained by hello-1.ko.
> >
> > >> Now this bring me to the question, Are there certain limitations of a
> > >> kernel module in an android device because this module gets insmod in
> > >> Ubuntu. Next action for me is to go for a hit and trial method and
> check
> > >> what lines in ec.c is causing the problem. Meanwhile if you some
> > >> suggestion, please let me know.
> >
> > > --
> > > unsubscribe: android-kernel+unsubscr...@googlegroups.com
> > > website:http://groups.google.com/group/android-kernel
> >
> > --
> > Thanks and Regards,
> >
> > Apurva Jaiswal
> >
> > Phone No. +358 465424993
> > Email: jaiswal.apu...@gmail.com
>
> --
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> website: http://groups.google.com/group/android-kernel
>
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