struct member detection

[MShura]

Hi!

The file <include/linux/fs.h> contains declaration of struct inode.

In kernel versions before 2.6.17(?) this struct contains member 
union{
  void *generic_ip;
} u;

In kernel versions after 2.6.19(?) this struct contains member 
void  *i_private

In 2.6.18 this struct can be first or second variant.

Is it possible to detect at compile time what kind of private pointer the
struct inode contains?

Thanks in advance.

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