pgd clarification

[Santosh Eraniose <santosh@sonysard.co.in>]

Hello,
In the mm_struct structure I notice only an entry for pgd_t* pgd.
Cannot a process memory space occupy more that 4MB of virtual addr space.
In that case how is one pgd sufficient?
1pgd can address 1024*4*1024 =4MB. or a 4k page
I expected a list of pgd so that on a pagefault, the process would navigate
thro the pgd, find the virtual address mapping to the physical page and
then return the pte?
Thanks in advance.
regards

--
Santosh Eraniose

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