Hi Aruna, Thank you so much for your information,
Thanks, Madhu On Sat, Feb 11, 2017 at 9:15 PM, Aruna Hewapathirane < [email protected]> wrote: > <snip> > >> Please help me out to understand below message mean. > > >> ubuntu@ubuntu-armhf:/home/Madhu/i2c$ dmesg > >> [ 704.283100] i2c_client: loading out-of-tree module taints kernel. > >> [ 704.285359] driver initialization > >> [ 704.285693] inside probe function > > What you should pay attention to more than worry about the out-of-tree > module is the text immediately following that. Says "taints kernel" right ? > What exactly that means is if you have problems later on with this kernel > and require debugging or community support to identify then resolve a bug > there will be no community support. > > When the kernel is tainted, it means that *it is in a state that is not > supported by the community*. Most kernel developers will ignore bug > reports involving tainted kernels, and community members may ask that you > correct the tainting condition before they can proceed with diagnosing > problems related to the kernel. In addition, some debugging functionality > and API calls may be disabled when the kernel is tainted. > [ reference: http://unix.stackexchange.com/questions/118116/linux-what- > is-a-tainted-kernel ] > > The primary reason for the *‘Tainted: ‘* string is to tell kernel > debuggers if this is a clean kernel or if anything unusual has occurred. > Tainting is permanent: even if an offending module is unloaded, the > tainted value remains to indicate that the kernel is not trustworthy. > [ reference: https://www.kernel.org/doc/html/latest/admin-guide/ > tainted-kernels.html?highlight=tainted ] > > Looking at your dmesg output you posted your module initialized ok and > your probe was called ok but if shit happens down the road your on your > own. Meaning if you ask for help most folks will ask you to fix the taint > issue before taking a look at your code :) > > Hope this helps - Aruna > > >> >> Regards, >> Madhu >> >> _______________________________________________ >> Kernelnewbies mailing list >> [email protected] >> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> >
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