diff options
| -rw-r--r-- | arch/x86/mm/pageattr_64.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/x86/mm/pageattr_64.c b/arch/x86/mm/pageattr_64.c index 4053832d410..e1c860800ff 100644 --- a/arch/x86/mm/pageattr_64.c +++ b/arch/x86/mm/pageattr_64.c @@ -260,3 +260,33 @@ void global_flush_tlb(void) on_each_cpu(flush_kernel_map, NULL, 1, 1); } EXPORT_SYMBOL(global_flush_tlb); + +#ifdef CONFIG_DEBUG_PAGEALLOC +void kernel_map_pages(struct page *page, int numpages, int enable) +{ + if (PageHighMem(page)) + return; + if (!enable) { + debug_check_no_locks_freed(page_address(page), + numpages * PAGE_SIZE); + } + + /* + * If page allocator is not up yet then do not call c_p_a(): + */ + if (!debug_pagealloc_enabled) + return; + + /* + * the return value is ignored - the calls cannot fail, + * large pages are disabled at boot time. + */ + change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); + + /* + * we should perform an IPI and flush all tlbs, + * but that can deadlock->flush only current cpu. + */ + __flush_tlb_all(); +} +#endif |