Messages in this thread | | | Date | Fri, 17 Oct 2008 15:07:13 +0800 | From | "Peter Teoh" <> | Subject | How to get the PTE pointer for a linear address? |
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If I allocate kernel memory via alloc_page(GFP_KERNEL), and convert that struct page pointer to linear address via page_address(), how do I derive the PTE pointer of that page?
Following the source code, I did the following:
pgd_t *pgd = pgd_offset_k(address);
if (pgd_none(*pgd)) { printk("no pgd "); return 0; } pud = pud_offset(pgd, address); if (pud_none(*pud)) { printk("no pud "); return 0; } pmd = pmd_offset(pud, address); if (pmd_none(*pmd)) { printk("no pmd "); return 0; }
pte = pte_offset_map(pmd, address);
===============> and in between here, the PTE pointer is returned (from pte_offset_map())? And so the PTE structure (pte_t) should be *pte?
pte_unmap(pte);
I suspect something is not right?
Thanks. -- Regards, Peter Teoh
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