obtaining a pte from a linear address

[Angelo Dell'Aera <buffer@users.sourceforge.net>]

For a  securit-related project I'm  developing, I need to  obtain page
table  entry   from  the  address   of  the  page   (obtained  through
__get_free_page() ).  
Infact  I need  to make  it read-only  through pte_wrprotect()  but it
needs as argument a pte_t.  I read include/linux/pagetable.h but found
nothing which seems to be useful for my purposes.

Regards,

Angelo Dell'Aera 'buffer' 
<buffer@users.sourceforge.net>

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