About EXPORT_SYMBOL

[Dave Hylands]

Hi kashish,

On Thu, Feb 10, 2011 at 5:18 AM, kashish bhatia <koolest77 at gmail.com> wrote:
> Hello All,
> I want to export a function named ext2_free_data() which is present in
> inode.c .
> This function is statically defined in this file. I omit the "static"
> keyword and exported it
> using EXPORT_SYMBOL(ext2_free_data).
> ext2_free_data() function declaration is not present in any header file , so
> I included its
> declaration in my own header file which I kept in fs/ext2 directory.

So generally speaking, functions that are declared static were done
that way for a reason.

> Now when I insert my module using insmod command ,it shows a error : Unknown
> symbol in module.

Did you rebuild the kernel as well? The kernel where the exported
symbol comes from must be rebuilt and you must load using that kernel.

Dave Hylands