Some Questions about Kernel Page Table

[lichangshou]

Hi all,

In linux-2.6.35.4, the page size of kernel image is 2M, which means that the
entity in pmd is PFN pointing to physical page.
For research, I want to change the page size of kernel image to 4K. I
modified the content of pmd to make each entity of pmd point to a new page
table.
Here is the my related code:
---------------------------------------------------------
 542         pte = alloc_low_page(&pte_phys);   // allocate a new page for
page table
 544         last_map_addr = phys_pte_init_remap(pte, address, end,
new_prot);  // initiate the entity of new page table
 545         unmap_low_page(pte);
 546
 547         spin_lock(&init_mm.page_table_lock);
 548         pmd_populate_kernel(&init_mm, pmd, __va(pte_phys));  // modify
this pmd entiity, make it point to the address of new page table.
 549
 550         spin_unlock(&init_mm.page_table_lock);
------------------------------------------------------------------------------------
After adding those code to kernel source, I test the new complied kernel,
but the kernel always reboot and can't work.
Thinking long time, I can't fix where the bug is.
Any suggestions for me?

Thanks,
Lee
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