Re: Message not appearing in mesg
On 7 July 2015 at 16:11, Sébastien Hinderer sebastien.hinde...@ens-lyon.org wrote: Hi Luis, Many thanks for your prompt and helpfulresponse! Do you have the relevant DEBUG macros activated in your kernel's configuration? Perhaps not... https://www.kernel.org/doc/local/pr_debug.txt Read this, thanks. But that has nothing to do with KConfigmacros, has it? http://elinux.org/Debugging_by_printing If not, activate them. Or if in a pinch, switch to using pr_alert() for development. What surprises me is that I made sue the message appears inthe .ko file and it was there,whereas it seems pr_debug discards its argument at compile time. Or is it at execution time? Thanks! Sébastien Compile time. pr_debug() is meant only for development and discarded for production builds. pr_debug(), which is ordinarily an empty macro that discards its arguments at compile time. To enable debugging output, build the appropriate file with -DDEBUG by adding CFLAGS_[filename].o := -DDEBUG That is the key part there. But it is good to also check the options you have in: make menuconfig- Kernel Hacking Enjoy, Luis ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Message not appearing in mesg
Thanks a lot Luis! Everything is clear now. Shérab. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Message not appearing in mesg
Hi Luis, Many thanks for your prompt and helpfulresponse! Do you have the relevant DEBUG macros activated in your kernel's configuration? Perhaps not... https://www.kernel.org/doc/local/pr_debug.txt Read this, thanks. But that has nothing to do with KConfigmacros, has it? http://elinux.org/Debugging_by_printing If not, activate them. Or if in a pinch, switch to using pr_alert() for development. What surprises me is that I made sue the message appears inthe .ko file and it was there,whereas it seems pr_debug discards its argument at compile time. Or is it at execution time? Thanks! Sébastien. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Message not appearing in mesg
On 7 July 2015 at 15:53, Sébastien Hinderer sebastien.hinde...@ens-lyon.org wrote: Dear all, I have a module that uses pr_debug at init. Although the module is successfully loaded, the message appears neither in dmesg, nor at the console. I tried toprint a 8 to /proc/sys/kernel/printk but that does not change anything. Any hint would be warmly appreciated. Thanks! Sébastien Do you have the relevant DEBUG macros activated in your kernel's configuration? https://www.kernel.org/doc/local/pr_debug.txt http://elinux.org/Debugging_by_printing If not, activate them. Or if in a pinch, switch to using pr_alert() for development. Luis ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
