2 * Copyright IBM Corp. 2011
3 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
5 #include <linux/module.h>
7 #include <linux/hugetlb.h>
8 #include <asm/pgtable.h>
10 static void change_page_attr(unsigned long addr, int numpages,
19 for (i = 0; i < numpages; i++) {
20 pgdp = pgd_offset(&init_mm, addr);
21 pudp = pud_offset(pgdp, addr);
22 pmdp = pmd_offset(pudp, addr);
23 if (pmd_huge(*pmdp)) {
27 ptep = pte_offset_kernel(pmdp, addr);
31 ptep_invalidate(&init_mm, addr, ptep);
37 int set_memory_ro(unsigned long addr, int numpages)
39 change_page_attr(addr, numpages, pte_wrprotect);
42 EXPORT_SYMBOL_GPL(set_memory_ro);
44 int set_memory_rw(unsigned long addr, int numpages)
46 change_page_attr(addr, numpages, pte_mkwrite);
49 EXPORT_SYMBOL_GPL(set_memory_rw);
52 int set_memory_nx(unsigned long addr, int numpages)
56 EXPORT_SYMBOL_GPL(set_memory_nx);