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* Copyright IBM Corp. 2011
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* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
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#include <linux/module.h>
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#include <linux/hugetlb.h>
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#include <asm/pgtable.h>
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static void change_page_attr(unsigned long addr, int numpages,
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for (i = 0; i < numpages; i++) {
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pgdp = pgd_offset(&init_mm, addr);
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pudp = pud_offset(pgdp, addr);
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pmdp = pmd_offset(pudp, addr);
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if (pmd_huge(*pmdp)) {
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ptep = pte_offset_kernel(pmdp, addr);
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ptep_invalidate(&init_mm, addr, ptep);
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int set_memory_ro(unsigned long addr, int numpages)
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change_page_attr(addr, numpages, pte_wrprotect);
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EXPORT_SYMBOL_GPL(set_memory_ro);
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int set_memory_rw(unsigned long addr, int numpages)
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change_page_attr(addr, numpages, pte_mkwrite);
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EXPORT_SYMBOL_GPL(set_memory_rw);
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int set_memory_nx(unsigned long addr, int numpages)
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EXPORT_SYMBOL_GPL(set_memory_nx);