On 7 July 2015 at 16:11, Sébastien Hinderer <Sebastien.Hinderer@xxxxxxxxxxxx> 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
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
make menuconfig-> Kernel Hacking
Enjoy,
Luis
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