help virt to phys address

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hi i need to map user to kernel space
but i need to get the phys add of the user mem ( i only have the vert
add ) ?
and is kernel 2.2.9 dif from 2.3.x
this is the code that i was using

#define nv_virt_to_phys(mm,addr) \
  virt_to_phys(( \
     pte_page( \
         *pte_offset( \
             pmd_offset( \
                 pgd_offset(mm, (addr)), \
             addr), \
         (addr)) \
     ) | ((addr) & (~PAGE_MASK))))

but it dose not work and it Oops the kernel
Unable to handle kernel Null pointer defererence at virtual address
0000000c

Thank you
    David <sector2@ihug.co.nz>

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