pr_debug

[Alexander Kapshuk]

On Wed, Mar 15, 2017 at 12:40 PM, Tobin C. Harding <me at tobin.cc> wrote:
> On Wed, Mar 15, 2017 at 12:01:39PM +0200, Alexander Kapshuk wrote:
>> On Wed, Mar 15, 2017 at 10:31 AM, Tobin C. Harding <me at tobin.cc> wrote:
>> > why does calling pr_debug() with more than one argument cause a sparse
>> > warning?
>> >
>> > drivers/mmc/core/sdio_io.c:70:9: error: unknown field name in initializer
>> >
>> > sdio_io.c:70:
>> > pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func));
>> >
>> > What can we do about this?
>> >
>> > thanks,
>> > Tobin.
>> >
>> > _______________________________________________
>> > Kernelnewbies mailing list
>> > Kernelnewbies at kernelnewbies.org
>> > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>> What is the version of the sources you are using?
>
> I'm usually working of gregKH's staging tree using branch staging-next
> and/or staging-testing
>
> thanks,
> Tobin.

'sdio_func_id()' is a macro defined here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/linux/mmc/sdio_func.h?id=refs/tags/v4.11-rc2
#define sdio_func_id(f) (dev_name(&(f)->dev))

The 'func' parameter passed into 'sdio_func_id()' is a pointer to
'struct device dev', which is a member of 'struct sdio_func' defined
here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/linux/mmc/sdio_func.h?id=refs/tags/v4.11-rc2

Based on my understanding of the error message you got, the error must
lie in code that initialises 'func' to a field name of a struct that
isn't known at compile time.

At this stage, I'm not sure how to identify the code where the faulty
initialisation takes place.