"Unable to handle kernel paging request" - what does that mean?

[Timur Tabi <timur.tabi@ammasso.com>]

The following function is causing this error:

unsigned long user_virt_to_phys(unsigned long address)
{
        pgd_t *pgd = pgd_offset(current->mm, address);
        pmd_t *pmd = pmd_offset(pgd, address);
#ifdef pte_offset_kernel
        pte_t *pte = pte_offset_kernel(pmd, address);
#else
        pte_t *pte = pte_offset(pmd, address);
#endif

        return pte_val(*pte) & PTE_MASK;
}

I'm assuming that the error message is displayed when I try to obtain 
the physical address for a page that isn't in memory (and therefore, has 
no physical address).  Is that correct?

--
Timur Tabi
Staff Software Engineer
timur.tabi@ammasso.com

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