diff options
| -rw-r--r-- | arch/x86/mm/pageattr.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index b8f5323..3ee1499 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -594,20 +594,35 @@ static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias); static int cpa_process_alias(struct cpa_data *cpa) { struct cpa_data alias_cpa; - int ret; + int ret = 0; if (cpa->pfn > max_pfn_mapped) return 0; - alias_cpa = *cpa; - alias_cpa.vaddr = (unsigned long) __va(cpa->pfn << PAGE_SHIFT); + /* + * No need to redo, when the primary call touched the direct + * mapping already: + */ + if (!within(cpa->vaddr, PAGE_OFFSET, + PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT))) { - ret = __change_page_attr_set_clr(&alias_cpa, 0); + alias_cpa = *cpa; + alias_cpa.vaddr = (unsigned long) __va(cpa->pfn << PAGE_SHIFT); + + ret = __change_page_attr_set_clr(&alias_cpa, 0); + } #ifdef CONFIG_X86_64 if (ret) return ret; /* + * No need to redo, when the primary call touched the high + * mapping already: + */ + if (within(cpa->vaddr, (unsigned long) _text, (unsigned long) _end)) + return 0; + + /* * If the physical address is inside the kernel map, we need * to touch the high mapped kernel as well: */ |