"implicit declaration of <some function>" error

[Srinivas Ganji]

This is ONLY a hint for finding the header files in the /usr/src/linux
directory. I do generally like this.

find include -type f | xargs grep "kthread_run"

Replace "kthread_run" with new strings for searching. This is ONLY a HINT
but you asked for clear explanation.

Regards,
Srinivas.


On Fri, Jul 19, 2013 at 3:38 PM, Ritesh Ranjan <r.ranjan789 at gmail.com>wrote:

> I keep getting "implicit declaration of <some function>" error quite
> often. So I'm assuming I am not adding the correct header files when I
> am writing the module.
>
> eg. I wanted to create a kernel thread using
> ktheard_create/kthread_run, but couldn't find which header to include.
> While I was looking for solutions I stumbled upon ctags. It mostly
> gets the job done, but not always. I couldn't find the proper header
> to use for open(inode,file); even though ctags pointed me to
> <linux/fs.h>, I still get the implicit declaration error.
>
> Is there any way of finding exactly which headers to include when one
> is trying to use a function? A detailed explanation would be really
> great.
>
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