diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Kconfig.debug | 1 | ||||
| -rw-r--r-- | mm/debug-pagealloc.c | 37 | ||||
| -rw-r--r-- | mm/page_alloc.c | 38 | ||||
| -rw-r--r-- | mm/page_ext.c | 4 |
4 files changed, 73 insertions, 7 deletions
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug index 1ba81c7769f..56badfc4810 100644 --- a/mm/Kconfig.debug +++ b/mm/Kconfig.debug @@ -12,6 +12,7 @@ config DEBUG_PAGEALLOC depends on DEBUG_KERNEL depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC depends on !KMEMCHECK + select PAGE_EXTENSION select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC ---help--- diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c index 789ff70c8a4..0072f2c5333 100644 --- a/mm/debug-pagealloc.c +++ b/mm/debug-pagealloc.c @@ -2,23 +2,49 @@ #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) +{ + return true; +} + +static void init_page_poisoning(void) +{ + 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) @@ -95,6 +121,9 @@ static void unpoison_pages(struct page *page, int n) void kernel_map_pages(struct page *page, int numpages, int enable) { + if (!page_poisoning_enabled) + return; + if (enable) unpoison_pages(page, numpages); else diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b64666cf586..e0a39d328ca 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -56,7 +56,7 @@ #include <linux/prefetch.h> #include <linux/mm_inline.h> #include <linux/migrate.h> -#include <linux/page-debug-flags.h> +#include <linux/page_ext.h> #include <linux/hugetlb.h> #include <linux/sched/rt.h> @@ -425,6 +425,22 @@ static inline void prep_zero_page(struct page *page, unsigned int order, #ifdef CONFIG_DEBUG_PAGEALLOC unsigned int _debug_guardpage_minorder; +bool _debug_guardpage_enabled __read_mostly; + +static bool need_debug_guardpage(void) +{ + return true; +} + +static void init_debug_guardpage(void) +{ + _debug_guardpage_enabled = true; +} + +struct page_ext_operations debug_guardpage_ops = { + .need = need_debug_guardpage, + .init = init_debug_guardpage, +}; static int __init debug_guardpage_minorder_setup(char *buf) { @@ -443,7 +459,14 @@ __setup("debug_guardpage_minorder=", debug_guardpage_minorder_setup); static inline void set_page_guard(struct zone *zone, struct page *page, unsigned int order, int migratetype) { - __set_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags); + struct page_ext *page_ext; + + if (!debug_guardpage_enabled()) + return; + + page_ext = lookup_page_ext(page); + __set_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); + INIT_LIST_HEAD(&page->lru); set_page_private(page, order); /* Guard pages are not available for any usage */ @@ -453,12 +476,20 @@ static inline void set_page_guard(struct zone *zone, struct page *page, static inline void clear_page_guard(struct zone *zone, struct page *page, unsigned int order, int migratetype) { - __clear_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags); + struct page_ext *page_ext; + + if (!debug_guardpage_enabled()) + return; + + page_ext = lookup_page_ext(page); + __clear_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); + set_page_private(page, 0); if (!is_migrate_isolate(migratetype)) __mod_zone_freepage_state(zone, (1 << order), migratetype); } #else +struct page_ext_operations debug_guardpage_ops = { NULL, }; static inline void set_page_guard(struct zone *zone, struct page *page, unsigned int order, int migratetype) {} static inline void clear_page_guard(struct zone *zone, struct page *page, @@ -869,6 +900,7 @@ static inline void expand(struct zone *zone, struct page *page, VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]); if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) && + debug_guardpage_enabled() && high < debug_guardpage_minorder()) { /* * Mark as guard pages (or page), that will allow to diff --git a/mm/page_ext.c b/mm/page_ext.c index 514a3bccd63..c2cd7b15f0d 100644 --- a/mm/page_ext.c +++ b/mm/page_ext.c @@ -51,6 +51,10 @@ */ static struct page_ext_operations *page_ext_ops[] = { + &debug_guardpage_ops, +#ifdef CONFIG_PAGE_POISONING + &page_poisoning_ops, +#endif }; static unsigned long total_usage; |