Le Tue, 22 Jan 2008 10:31:14 +0100, "Vegard Nossum" <vegard.nossum@xxxxxxxxx> a écrit : > It allocates two pages and prints out the virtual address of the page > itself, then the pte_t* of that address. When run, I get this: > > pte for c7802000 = c0438c78 > pte for c7803000 = c0438c78 > > So it seems that the two pages actually share a pte. How is this > possible? Am I using lookup_address() wrongly? Probably because the identity mapping of the kernel uses large pages instead of 4k-pages, so that what you get is not a PTE address, but rather a PMD address. Look at the code of lookup_address() : 034 if (pmd_large(*pmd)) 035 return (pte_t *)pmd; Note that I'm not sure, it's just a quick idea. Sincerly, Thomas -- Thomas Petazzoni, thomas.petazzoni@xxxxxxxxxxxxxxxxxx Free Electrons http://free-electrons.com
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