diff options
Diffstat (limited to 'mm/debug-pagealloc.c')
| -rw-r--r-- | mm/debug-pagealloc.c | 45 |
1 files changed, 40 insertions, 5 deletions
diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c index 789ff70c8a4a..5bf5906ce13b 100644 --- a/mm/debug-pagealloc.c +++ b/mm/debug-pagealloc.c @@ -2,23 +2,55 @@ #include <linux/string.h> #include <linux/mm.h> #include <linux/highmem.h> -#include <linux/page-debug-flags.h> +#include <linux/page_ext.h> #include <linux/poison.h> #include <linux/ratelimit.h> +static bool page_poisoning_enabled __read_mostly; + +static bool need_page_poisoning(void) +{ + if (!debug_pagealloc_enabled()) + return false; + + return true; +} + +static void init_page_poisoning(void) +{ + if (!debug_pagealloc_enabled()) + return; + + page_poisoning_enabled = true; +} + +struct page_ext_operations page_poisoning_ops = { + .need = need_page_poisoning, + .init = init_page_poisoning, +}; + static inline void set_page_poison(struct page *page) { - __set_bit(PAGE_DEBUG_FLAG_POISON, &page->debug_flags); + struct page_ext *page_ext; + + page_ext = lookup_page_ext(page); + __set_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags); } static inline void clear_page_poison(struct page *page) { - __clear_bit(PAGE_DEBUG_FLAG_POISON, &page->debug_flags); + struct page_ext *page_ext; + + page_ext = lookup_page_ext(page); + __clear_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags); } static inline bool page_poison(struct page *page) { - return test_bit(PAGE_DEBUG_FLAG_POISON, &page->debug_flags); + struct page_ext *page_ext; + + page_ext = lookup_page_ext(page); + return test_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags); } static void poison_page(struct page *page) @@ -93,8 +125,11 @@ static void unpoison_pages(struct page *page, int n) unpoison_page(page + i); } -void kernel_map_pages(struct page *page, int numpages, int enable) +void __kernel_map_pages(struct page *page, int numpages, int enable) { + if (!page_poisoning_enabled) + return; + if (enable) unpoison_pages(page, numpages); else |