diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/mm/pageattr-test.c | 8 | ||||
| -rw-r--r-- | arch/x86/mm/pageattr.c | 96 |
2 files changed, 58 insertions, 46 deletions
diff --git a/arch/x86/mm/pageattr-test.c b/arch/x86/mm/pageattr-test.c index 6a41a0f0c14..fe73905d075 100644 --- a/arch/x86/mm/pageattr-test.c +++ b/arch/x86/mm/pageattr-test.c @@ -162,8 +162,8 @@ static __init int exercise_pageattr(void) continue; } - err = change_page_attr_addr(addr[i], len[i], - pte_pgprot(pte_clrhuge(pte_clrglobal(pte0)))); + err = change_page_attr_clear(addr[i], len[i], + __pgprot(_PAGE_GLOBAL)); if (err < 0) { printk(KERN_ERR "CPA %d failed %d\n", i, err); failed++; @@ -197,8 +197,8 @@ static __init int exercise_pageattr(void) failed++; continue; } - err = change_page_attr_addr(addr[i], len[i], - pte_pgprot(pte_mkglobal(*pte))); + err = change_page_attr_set(addr[i], len[i], + __pgprot(_PAGE_GLOBAL)); if (err < 0) { printk(KERN_ERR "CPA reverting failed: %d\n", err); failed++; diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index a2d747c0614..23f0aa3d01c 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -228,7 +228,6 @@ repeat: /** * change_page_attr_addr - Change page table attributes in linear mapping * @address: Virtual address in linear mapping. - * @numpages: Number of pages to change * @prot: New page table attribute (PAGE_*) * * Change page attributes of a page in the direct mapping. This is a variant @@ -240,10 +239,10 @@ repeat: * Modules and drivers should use the set_memory_* APIs instead. */ -static int change_page_attr_addr(unsigned long address, int numpages, - pgprot_t prot) +static int change_page_attr_addr(unsigned long address, pgprot_t prot) { - int err = 0, kernel_map = 0, i; + int err = 0, kernel_map = 0; + unsigned long pfn = __pa(address) >> PAGE_SHIFT; #ifdef CONFIG_X86_64 if (address >= __START_KERNEL_map && @@ -254,30 +253,27 @@ static int change_page_attr_addr(unsigned long address, int numpages, } #endif - for (i = 0; i < numpages; i++, address += PAGE_SIZE) { - unsigned long pfn = __pa(address) >> PAGE_SHIFT; + if (!kernel_map || pte_present(pfn_pte(0, prot))) { + err = __change_page_attr(address, pfn, prot); + if (err) + return err; + } - if (!kernel_map || pte_present(pfn_pte(0, prot))) { - err = __change_page_attr(address, pfn, prot); - if (err) - break; - } #ifdef CONFIG_X86_64 - /* - * Handle kernel mapping too which aliases part of - * lowmem: - */ - if (__pa(address) < KERNEL_TEXT_SIZE) { - unsigned long addr2; - pgprot_t prot2; - - addr2 = __START_KERNEL_map + __pa(address); - /* Make sure the kernel mappings stay executable */ - prot2 = pte_pgprot(pte_mkexec(pfn_pte(0, prot))); - err = __change_page_attr(addr2, pfn, prot2); - } -#endif + /* + * Handle kernel mapping too which aliases part of + * lowmem: + */ + if (__pa(address) < KERNEL_TEXT_SIZE) { + unsigned long addr2; + pgprot_t prot2; + + addr2 = __START_KERNEL_map + __pa(address); + /* Make sure the kernel mappings stay executable */ + prot2 = pte_pgprot(pte_mkexec(pfn_pte(0, prot))); + err = __change_page_attr(addr2, pfn, prot2); } +#endif return err; } @@ -307,16 +303,24 @@ static int change_page_attr_set(unsigned long addr, int numpages, pgprot_t current_prot; int level; pte_t *pte; + int i, ret; - pte = lookup_address(addr, &level); - if (pte) - current_prot = pte_pgprot(*pte); - else - pgprot_val(current_prot) = 0; + for (i = 0; i < numpages ; i++) { - pgprot_val(prot) = pgprot_val(current_prot) | pgprot_val(prot); + pte = lookup_address(addr, &level); + if (pte) + current_prot = pte_pgprot(*pte); + else + pgprot_val(current_prot) = 0; - return change_page_attr_addr(addr, numpages, prot); + pgprot_val(prot) = pgprot_val(current_prot) | pgprot_val(prot); + + ret = change_page_attr_addr(addr, prot); + if (ret) + return ret; + addr += PAGE_SIZE; + } + return 0; } /** @@ -344,16 +348,24 @@ static int change_page_attr_clear(unsigned long addr, int numpages, pgprot_t current_prot; int level; pte_t *pte; - - pte = lookup_address(addr, &level); - if (pte) - current_prot = pte_pgprot(*pte); - else - pgprot_val(current_prot) = 0; - - pgprot_val(prot) = pgprot_val(current_prot) & ~pgprot_val(prot); - - return change_page_attr_addr(addr, numpages, prot); + int i, ret; + + for (i = 0; i < numpages; i++) { + pte = lookup_address(addr, &level); + if (pte) + current_prot = pte_pgprot(*pte); + else + pgprot_val(current_prot) = 0; + + pgprot_val(prot) = + pgprot_val(current_prot) & ~pgprot_val(prot); + + ret = change_page_attr_addr(addr, prot); + if (ret) + return ret; + addr += PAGE_SIZE; + } + return 0; } int set_memory_uc(unsigned long addr, int numpages) |