On Wed, Aug 07, 2013 at 01:28:12PM -0700, Andrew Morton wrote:
> 
> Good god.
> 
> I wonder if these can be turned into out-of-line functions in some form
> which humans can understand.
> 
> or
> 
> #define pte_to_pgoff(pte)
> 	frob(pte, PTE_FILE_SHIFT1, PTE_FILE_BITS1) +
> 	frob(PTE_FILE_SHIFT2, PTE_FILE_BITS2) +
> 	frob(PTE_FILE_SHIFT3, PTE_FILE_BITS3) +
> 	frob(PTE_FILE_SHIFT4, PTE_FILE_BITS1 + PTE_FILE_BITS2 + PTE_FILE_BITS3)

Hi, here is what I ended up with. Please take a look (I decided to post
patch in the thread since it's related to the context of the mails).